Antheridium Black & White Stock Photos
RFT5YYYT–This picture showing antheridium of bracken. An antheridium is the organ producing and containing male gametes, vintage line drawing or engraving illu
RFT61G3F–This picture shows Archegonia Plant. The corresponding male organ is called the antheridium. It has a long neck canal or venter and a swollen base, vi
RM2AX1R1X–The elements of botany for beginners and for schools . enwrapped by tubular cells twisted around it: by the side of this is asmaller and globular antheridium. The latter breaks up into eight shield- FlG. 553. Agarum Tumeri, Sea Colander (so called from the perforations withwhich the frond, as it grows, becomes riddled); very much reduced in size. Fio. 554. Upper end of a Rockweed, Fucus vesioulosus, reduced half or more,b, the fnictifioatjon. 168 CRYPTOGAMOUS OR FLOWEBLESS PLANTS. [SECTION 17. shaped pieces, with au internal stalk, and bearing long and ribbon-shapedfilaments, which consist of
RFT5Y4MA–A diagram of Antheridium of Chara: a, the four upper shields; b, interior; c, Antheridial filament; d, two Antherozoids, vintage line drawing or engra
RM2MPP2GW–Fucus vesiculosus, 1. piece of alga, l air bubbles, r rib, a cavities, 2. section through a cavity with oogonia (o), 3. antheridia (a), spermatozoids hatching from an antheridium., Fucus vesiculosus, anonym (botany book, 1910), Blasentang, 1. Stück der Alge, l Luftblasen, r Rippe, a Hohlräume, 2. Durchschnitt durch einen Hohlraum mit Oogonien (o), 3. Antheridien (a), Spermatozoiden aus einem Antheridium ausschlüpfend, Fucus vésiculeux, 1. morceau d'algue, l bulles d'air, r côte, a cavités, 2. section à travers une cavité avec oogonies (o), 3. anthéridies (a), spermatozoïdes émergeant d'un anth
RFT5RA74–A Picture shows Archegonia Plant. This is typically located on the surface of the plant thallus, although in the hornworts they are embedded. It is re
RMMXCKHN–. Marchantia polymorpha, single antheridium . 1900. E. Strasburger 396 Marchantia polymorpha Antheridium Strasburger1900
RM2AX1RB4–The elements of botany for beginners and for schools . enwrapped by tubular cells twisted around it: by the side of this is asmaller and globular antheridium. The latter breaks up into eight shield- FlG. 553. Agarum Tumeri, Sea Colander (so called from the perforations withwhich the frond, as it grows, becomes riddled); very much reduced in size. Fio. 554. Upper end of a Rockweed, Fucus vesioulosus, reduced half or more,b, the fnictifioatjon. 168 CRYPTOGAMOUS OR FLOWEBLESS PLANTS. [SECTION 17. shaped pieces, with au internal stalk, and bearing long and ribbon-shapedfilaments, which consist of
RMMYK66G–. Marchantia polymorpha, single antheridium . 1900. E. Strasburger 344 Marchantia polymorpha Antheridium Strasburger1900
RMPG1Y30–. Lectures on the evolution of plants. Botany; Plants. MOSSES AND LIVERWORTS 103. among the algge is found in the stoneworts (Characese), but the differences in the vegetative parts between these and the Hepaticse are too great to admit of the idea of any but the remotest relationship existing a between the two, and at present it must be admitted that the gulf between Algse and Archegoniates is a very deep one. The antheridium is not so different from that of some algse, but is much more com- plicated than in any but the Characese. In the Archegoniates it has the form of a capsule (Fig. 26, C)
![An illustrated encyclopædic medical dictionaryBeing a dictionary of the technical terms used by writers on medicine and the collateral sciences, in the Latin, English, French and German languages . nerve. Both the roof-cs and the floor-cs are hair-cs.[F.] 2. A c. forming a hair. [B.]—Hares c. The element of aHares battery (q. v.). [B.] —Head-c. Syn.: capitulum. Arounded c. found m the antheridium of the Choracece, upon eachof the manubria. [B, 279.]—Heckle c. See Prickle-c.—Henles c.See Spermatocyte.-Hensens supporting cs. See Prop-cs ofHensen.—Repa.tic c. See Z/i-uer-c—Hills c, Hills graTity Stock Photo](https://c8.alamy.com/comp/2AN84XJ/an-illustrated-encyclopdic-medical-dictionarybeing-a-dictionary-of-the-technical-terms-used-by-writers-on-medicine-and-the-collateral-sciences-in-the-latin-english-french-and-german-languages-nerve-both-the-roof-cs-and-the-floor-cs-are-hair-cs-f-2-a-c-forming-a-hair-b-hares-c-the-element-of-ahares-battery-q-v-b-head-c-syn-capitulum-arounded-c-found-m-the-antheridium-of-the-choracece-upon-eachof-the-manubria-b-279-heckle-c-see-prickle-chenles-csee-spermatocyte-hensens-supporting-cs-see-prop-cs-ofhensenrepatic-c-see-zi-uer-chills-c-hills-gratity-2AN84XJ.jpg "An illustrated encyclopædic medical dictionaryBeing a dictionary of the technical terms used by writers on medicine and the collateral sciences, in the Latin, English, French and German languages . nerve. Both the roof-cs and the floor-cs are hair-cs.[F.] 2. A c. forming a hair. [B.]—Hares c. The element of aHares battery (q. v.). [B.] —Head-c. Syn.: capitulum. Arounded c. found m the antheridium of the Choracece, upon eachof the manubria. [B, 279.]—Heckle c. See Prickle-c.—Henles c.See Spermatocyte.-Hensens supporting cs. See Prop-cs ofHensen.—Repa.tic c. See Z/i-uer-c—Hills c, Hills graTity Stock Photo")
RM2AN84XJ–An illustrated encyclopædic medical dictionaryBeing a dictionary of the technical terms used by writers on medicine and the collateral sciences, in the Latin, English, French and German languages . nerve. Both the roof-cs and the floor-cs are hair-cs.[F.] 2. A c. forming a hair. [B.]—Hares c. The element of aHares battery (q. v.). [B.] —Head-c. Syn.: capitulum. Arounded c. found m the antheridium of the Choracece, upon eachof the manubria. [B, 279.]—Heckle c. See Prickle-c.—Henles c.See Spermatocyte.-Hensens supporting cs. See Prop-cs ofHensen.—Repa.tic c. See Z/i-uer-c—Hills c, Hills graTity
RMMWFRP6–. Marchantia polymorpha, single antheridium . 1900. E. Strasburger 395 Marchantia polymorpha Antheridium Strasburger1900
RMPG05WC–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE JUNGERMANNIALES 8i antheridium body (Fig. 33, D). At this stage and the one preceding it Sphcerocarpus recalls the structure of the anther- idium of the Characeas, although the succession of walls is not exactly the same. The divisions of the central cells are ex- tremely regular, walls being formed at right angles, so that the sperm cells are almost perfectly cubical, and the limits of the primary central cells are recognisable for a long time. The development of the antheridial envelope
RMRE0P3R–. Elementary botany. Botany. Fig. igo. Antheridium of a foliose liverwort (jiin- germannia;.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Atkinson, George Francis, 1854-1918. New York, H. Holt
RMPG3RD0–. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAPTER V.—COMPARATIVE REVIEW ASCOMYCETES.—PYRONEMA. 209 embraces its apex and presses its obtuse extremity firmly against it. When this has taken place, seldom before, the tube is delimited by a firm transverse wall from the inflated portion of the archicarp, and, as soon as the wall is formed, the membrane in each of the connected organs is dissolved at the point of contact of the tube with the antheridium, and the protoplasmic bodies of the two organs unite togethe
RMRDWG0N–. Elementary botany. Botany. Fig. 190. Antheridium of a foliose liverwort (jun- germannia).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Atkinson, George Francis, 1854-1918. New York, H. Holt
RMPFYEK7–. A text-book of botany for secondary schools. Botany. Fig. 133.—Peronospara: A, oogonium (o) with antheridium (a) in contact; B, tube from antheridium penetrating oogonium; C, oogonium containing oospore.— After DeBaby.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928. New York, D. Appleton
RMRE1H4N–. The ferns of Bombay. Ferns. 15. Fig. 3.—An Antheridium (magnified) ; Sp. = Sperm.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Blatter, Ethelbert, 1877-1934; Almeida, J. F. d' (Joseph Francis). Bombay, D. B. Taraporevala Sons & Co.
RMPG3CP7–. Plant studies; an elementary botany. Botany. 304 I'LAXT STUDIES IDS. The antheridium.—The male orgun of the Br^yophytes is called an antheridium, just as among Thalloi^hytes, but it has a very diflt'oreut structure. In general among the. iSri^^ftjSffe .. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
RMRE1JBR–. Plant studies; an elementary botany. Botany. 304 PLANT STUDIES 198. The antheridium.—The male organ of the Bryophytes is called an antheridium, just as among Thallophytes, but it has a very different structure. In general among the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
RMPG05KN–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. ISO MOSSES AND FERNS CHAP. The full-grown antheridium is mot-e flattened than in either species of Anthoceros examined by me, and the stalk shorter and thicker, but otherwise closely resembles it, although the extremely symmetrical arrangement of the cells, especially of the wall, is much less noticeable. The archegonia correspond very closely, both in position and structure, with those of the other genera, the most marked peculiarity being the more nearly equal diameter of the cover cell and
RMRDTWDG–. Plants; a text-book of botany. Botany. BKYOPHYTES 99 63. The antheridium.—The male organ of the Bryophytes is called an antheridium, just as among Thallophytes, but it has a very different structure. In general among the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928. New York, D. Appleton and company
RMPG055B–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. XI LEPTOSPORANGIAT^ HETEROSPOREM 421 four hours for its completion. Pilularia approaches much nearer to the Polypodiaceas in the structure of the antheridium (Fig. 246). The first funnel-shaped wall is much more frequently extended to the basal wall, and the two groups of sperm cells are much less distinct than in Marsilia. The spermatqzoids of Marsilia are at once distinguished by a great number of coils, sometimes thirteen or fourteen in M. vestita. The cilia are very numerous, but are attac
RMRDTNDD–. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. 148 PYRENOMYCETES [CH. two nuclei each. In his opinion, the second nucleus in the originally uni- nucleate cell, is derived from its multinucleate neighbour, which he terms the antheridium ; the other binucleate cells receive their nuclei from it by conjugate division, and are the beginnings of ascogenous hyphae. Though he was unable to see either the entrance of the second nucleus, or the process of conjugate division, his facts are decidedly suggestive, but they point less to normal fertilization than to the pseudapogamous association o
RMPG41BM–. Essentials of botany. Botany; Botany. 276 ESSENTIALS OF BOTANY. Fig. 201. The Antheridium of a Moss {Funaria) and its Contents. a, antheridium; 6, escaping sperms (X 350); c, a single sperm of an- other moss (X 800).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
RMRDAAMG–. A text-book of botany for secondary schools. Botany. Fig. 133.—Peronospara: A, oogonium (o) with antheridium (a) in contact; B, tube from antheridium penetrating oogonium; C, oogonium containing oospore.— After DeBaby.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928. New York, D. Appleton
RMPG05E2–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. VII PTERIDOPHYTA—FILICINE^—OPHIOGLOSSACEJE 237 from which the cover of the antheridium is formed. The outer wall of the antheridium remains for the most part but one cell thick, in tljis respect more resembling Marattia than it does Botrychium. The antheridium also opens by a single, nearly triangular opercular cell (Fig. 125, E), as it does in Marattia. The spermatozoids were not seen, but probably resemble those of Botrychium or Marattia. The first division of the young archegonium is the sa
RMRDG4GM–. Lectures on the evolution of plants. Botany; Plants. MOSSES AND LIVERWORTS 103. among the algge is found in the stoneworts (Characese), but the differences in the vegetative parts between these and the Hepaticse are too great to admit of the idea of any but the remotest relationship existing a between the two, and at present it must be admitted that the gulf between Algse and Archegoniates is a very deep one. The antheridium is not so different from that of some algse, but is much more com- plicated than in any but the Characese. In the Archegoniates it has the form of a capsule (Fig. 26, C)
![. Photomicrographs of botanical studies. Photomicrography. Upper portion of stel- late disc of thallus. Fibrous liundle. ArcheLSonia (Unfurtilisfd) I Sporogonium, with i spores and elaters. Stalk of stellate disc. 12.—Fruiting Fronds, of " Chara sp.". Leaves. Oogonium Antheridium.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Flatters, Milborne & McKechnie Ltd. Manchester : Flaters, Milborne & McKechnie Stock Photo](https://c8.alamy.com/comp/PG028H/photomicrographs-of-botanical-studies-photomicrography-upper-portion-of-stel-late-disc-of-thallus-fibrous-liundle-archelsonia-unfurtilisfd-i-sporogonium-with-i-spores-and-elaters-stalk-of-stellate-disc-12fruiting-fronds-of-quot-chara-spquot-leaves-oogonium-antheridium-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-flatters-milborne-amp-mckechnie-ltd-manchester-flaters-milborne-amp-mckechnie-PG028H.jpg ". Photomicrographs of botanical studies. Photomicrography. Upper portion of stel- late disc of thallus. Fibrous liundle. ArcheLSonia (Unfurtilisfd) I Sporogonium, with i spores and elaters. Stalk of stellate disc. 12.—Fruiting Fronds, of " Chara sp.". Leaves. Oogonium Antheridium.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Flatters, Milborne & McKechnie Ltd. Manchester : Flaters, Milborne & McKechnie Stock Photo")
RMPG028H–. Photomicrographs of botanical studies. Photomicrography. Upper portion of stel- late disc of thallus. Fibrous liundle. ArcheLSonia (Unfurtilisfd) I Sporogonium, with i spores and elaters. Stalk of stellate disc. 12.—Fruiting Fronds, of " Chara sp.". Leaves. Oogonium Antheridium.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Flatters, Milborne & McKechnie Ltd. Manchester : Flaters, Milborne & McKechnie
RMRDH9MB–. Essentials of botany. Botany; Botany. 276 ESSENTIALS OF BOTANY. Fig. 201. The Antheridium of a Moss {Funaria) and its Contents. a, antheridium; 6, escaping sperms (X 350); c, a single sperm of an- other moss (X 800).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
RMPG05HC–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 10 MOSSES AND FERNS CIIAP, Whether the first antheridium, as in Andrecea and Foniinalis, arises from the apical cell is doubtful, and it is impossible to trace any regularity in the order of formation of the very numerous antheridia. Except in old plants, all stages of de- velopment are found together, and the history of the anther- idium may be easily followed. A superficial cell projects above its neighbours, and this papilla is cut off by a transverse wall.. Fig. 102.—Funaria hygrometrica.
RMRDYFGX–. A textbook of botany for colleges and universities ... Botany. 128 MORPHOLOGY antheridium development resembles closely the eusporangiate method of Sporangium development, and is always associated with it. It is interesting to note that only the Anthoccrotales amon^ brvophvtes approach this method of antheridium formation in the fact that the inner cell following the periclinal division p|ives rise to the sper- matogenous tissue. The sperms are re- markable among pteridophvtes in be- ing biciliate, a char- acter which belorigs to the sperms of bryophytes (fig. 282). Archegonium.— The archego
RMPG4D0K–. Diseases of truck crops and their control . Vegetables. Fig. 5. Pythium deBaryanum. a. Mycelium, b. conidiophore bearing con- idia, c. germinating conidium, d. tertil- ized oogonium and adjommg empty antheridium, e. oospore.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Taubenhaus, Jacob Joseph, 1884-1937. New York : E. P. Dutton & Co.
RMRE1R56–. Nature and development of plants. Botany. 220 REPRODUCTION OF A WATER MOULD the gametes is perhaps due to their exposure to atmospheric conditions, as would be the case when growing upon terrestrial or floating organic matter. The lack of water for the transport of the male gametes is nicely met by a tubular outgrowth of the antheridium which penetrates the oogonium when it ruptures, discharging the male close to the female gametes (Fig. 130, D, an). In the majority of the species, singularly enough, the female gametes germinate without being fertilized. The gametospore germinates as in Vauc
RMPG42X0–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 130 PHYCOMYCETES. wet season is very favourable to it. The mycelium is non- septate and spreads through the intercellular spaces of the host, nourished by button-like haustoria sunk into the host-cells. The antheridium comes into contact with the oogonium by a fertilization tube, which, however, remains closed. The oospores hibernate in leaves and fruit. Frevention} Ammoniacal copper carbonate solution, eau celeste,
RMRE1GF8–. Fungi; their nature, influence, and uses;. Fungi. 172 FUNGI. fecundation, should become the reproductive body, vegetable egg, or oospore. The gonosphere having been formed, the antheridium shoots out from the centre of its face, close against the oogonium, a straight tube, which perforates the walls of the female cell, and traversing the protoplasm of its periphery, directs itself to the gonosphere. It ceases to elongate itself as soon as it touches it, and the gonosphere becomes clothed with a membrane of cellulose, and takes a regular spheroidal form. Considering the great resemblance of t
RMPG4B23–. Botany for agricultural students . Botany. 368 THALLOPHYTES numerous nuclei of the antheridium flow into the trichogyne and pass on into the oogonium where thej- pair and fuse with the numerous nuclei of the oogonium. From the fertilized oogonium, now known as the ascogoniuin, branches called ascogenous hyphae are developed and on the ultimate branches of these are produced the asci. From beneath the ascogonium sterile hyphae (hyphae producing no asci) grow up among the ascoge- nous hj^phae and constitute the paraphyses of the hymenium. Other sterile hyphae form the wall of the cup-shaped pl
RMRDXHDF–. Introduction to the study of fungi; their organography, classification, and distribution, for the use of collectors. Fungi. FER TI LIS A TION 61 extremity and become clavate, to form antheridia, and one of these applies itself by the obtuse extremity to the/ face of each oogonium. With this development the contents of the oogonium become aggregated into a spherical form in the centre to constitute a gonosphere. A slender tube is projected from the applied end of the antheridium into the oogonium until it reaches the gonosphere, when it ceases further growth. After this contact the gonosphere
RMPG1Y3G–. Lectures on the evolution of plants. Botany; Plants. THE FUNGI 91. arrangement; but in all the higher ones they are borne in definite spore-fruits of characteristic form. This spore- fruit is undoubtedly, in many instances, the result of fertilization, being pro- duced by the formation of a peculiar cell, the archi- carp, which corresponds to the oogonium of the Phy- comycetes. This is usually fertilized by direct contact with the antheridium, and from it, more or less di- rectly, are produced the spore-sacs or asci. A good example of these simpler Ascomycetes is offered by the mildews which
![. Elementary botany. Botany. Fig io8. Vaucheria sessilis, one antheridium between two oogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. When these are formed the antherid- ium opens at the end and they escape. It is after the escape of these spermatozoids that the antheridium is collapsed. Each spermatozoid is a male gamete. 252. Oogonium.—The oogonia are short branches also, but they become large and jl somewhat oval. The / ' septum which separates the . protoplasm from that of "" the main thread is as we see near the junction of the Stock Photo](https://c8.alamy.com/comp/RE0PBJ/elementary-botany-botany-fig-io8-vaucheria-sessilis-one-antheridium-between-two-oogonia-the-antheridium-forms-numerous-small-oval-bodies-each-with-two-slender-lashes-the-cilia-when-these-are-formed-the-antherid-ium-opens-at-the-end-and-they-escape-it-is-after-the-escape-of-these-spermatozoids-that-the-antheridium-is-collapsed-each-spermatozoid-is-a-male-gamete-252-oogoniumthe-oogonia-are-short-branches-also-but-they-become-large-and-jl-somewhat-oval-the-septum-which-separates-the-protoplasm-from-that-of-quotquot-the-main-thread-is-as-we-see-near-the-junction-of-the-RE0PBJ.jpg ". Elementary botany. Botany. Fig io8. Vaucheria sessilis, one antheridium between two oogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. When these are formed the antherid- ium opens at the end and they escape. It is after the escape of these spermatozoids that the antheridium is collapsed. Each spermatozoid is a male gamete. 252. Oogonium.—The oogonia are short branches also, but they become large and jl somewhat oval. The / ' septum which separates the . protoplasm from that of "" the main thread is as we see near the junction of the Stock Photo")
RMRE0PBJ–. Elementary botany. Botany. Fig io8. Vaucheria sessilis, one antheridium between two oogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. When these are formed the antherid- ium opens at the end and they escape. It is after the escape of these spermatozoids that the antheridium is collapsed. Each spermatozoid is a male gamete. 252. Oogonium.—The oogonia are short branches also, but they become large and jl somewhat oval. The / ' septum which separates the . protoplasm from that of "" the main thread is as we see near the junction of the
RMPG01JC–. The principles of botany, as exemplified in the Cryptogamia. For the use of schools and colleges. Cryptogams; Plant anatomy; 1853. CELLULARES, OE CELLULAR PLANTS. Fig. 31. 75. contains a phytozoon. Surrounding the perfect antheridium, there are abortive filaments or paraphyses p.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coultas, Harland, d. 1877; Stifle, Cloyd B. sgn. Philadelphia, Lindsay and Blakiston
RMRE0RMF–. An introduction to vegetable physiology. Plant physiology. EBPEODUCTION 4B9 be illustrated by studying a series of forms. The earliest indication of it, which we can find, is exhibited by the HydwpteridecB, of which Salvinia is a characteristic type. Salvinia is a heterosporous form, each microspore of which gives rise to a very rudimentary prothallium bearing only one antheridium with four antherozoids (fig. 175). The megaspore, like the microspore, is hberated from the sporangium, and on germination it produces a prothallium, part of which remains in the spore and part protrudes from it (f
RMPG05TH–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. FiO. 4i.—Fossombronia longiseta; early stages in the development of the antheridium, X525; drawings made by Mr. H. B. Humphrey.' D, cross-section. In Fossombronia (Fig. 43), which in several respects re- calls Sphcerocarpus or Geothallus, the first divisions in the an- theridium are median ones, so that iij both longitudinal and transverse sections the antheridium appears toibe divided into equal quadrants. The first division, however, is vertical, as it is in Aneura. The archegonia are borne
RMRDWFMB–. Elementary botany. Botany. FERNS. 181 These are the an-. tered over this portion of the prothallium theridia. If the pro- thallia have not been watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridium, for when the prothallia .. ., ... , ls'.223' ,, r Section or anthendia showing sperm cells, and spermato- are freshly placed in zoids in the one at the risht- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and all the spermatozoids
RMPG00P8–. Lessons in botany. Botany. Fig. 144. Fig. 145. Section of antheridia showing sperm cells, and spermato- Different views of spermatozoids; zoids in the one at the right. in a quiet condition ; in motion (Adiantum concinnum). 281. Antheridia.—If we search among the rhizoids we see small rounded elevations as shown in figure 139 scattered over this portion of the prothallium. These are the antheridia. If the prothallia have not been watered for a day or so, we may- have an opportunity of seeing the spermatozoids coming out of the antheridium, for when the prothallia are freshly placed in wate
RMRDYH12–. An introduction to vegetable physiology. Plant physiology. 430 VEGETABLE PHYSIOLOGY. be examined by studying a series of forms. The earliest indication of it which we can find is exhibited by the Hydropteridece, of which Salvinia is a characteristic type. Salvinia is a heterosporous form, each microspore of which gives rise to a very rudimentary prothallium bearing only one antheridium with four antherozoids (fig. 175). The megaspore, like the microspore, is liberated from the sporangium and on germination it produces a prothallium, part of which remains in the spore and part protrudes from
RMPG1Y5T–. Lectures on the evolution of plants. Botany; Plants. 62 EVOLUTION OF PLANTS th^ cell, and the cells have long been favorite subjects for demonstrating this phenomenon. The original nucleus of these elongated cells becomes early divided into many, but these secondary nuclei are not formed. Via, 14.—A, a plant of Chara, one of the Characese, showing the division of the stem into nodes and internodes, and the method of branching; B, part of a leaf with an antheridium an, and oogonium, og; I, leaflets^ at the node of the leaf; C, a group of filaments from the interior of the antheridium; each ce
RMRE0RCJ–. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. 24 THE OPHIOGLOSSALES antheridium is but one cell in thickness, and I have verified this for both of the species under consideration. The first wall to be formed in the cover cell is a nearly median one and vertical (fig. 12, B), and this is followed by a second wall which intersects it, as well as one of the lateral walls of the primary cover cell, so as to include a nearly triangular cell. In this triangular cell there are later formed, as both Bruchmann and Lang showed, a
![. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 320 MOSSES AND FERNS lirBuller also showed that the starch which is usually present in "the vesicle of the spermatozoid, when it escapes from the antheridium, disappears completely in species where the period "of -activity is prolonged. Thus in Gymnogramme Mertensii, â¢the swarm-period lasted about two hours, and during this time the starch disappeared completely. Fertilisation i Shaw (2) has made a careful study of the fertilisation in Struthioptcris and in Onoclea. He states that b Stock Photo](https://c8.alamy.com/comp/PG0CK4/the-structure-and-development-of-mosses-and-ferns-archegoniatae-plant-morphology-mosses-ferns-320-mosses-and-ferns-lirbuller-also-showed-that-the-starch-which-is-usually-present-in-quotthe-vesicle-of-the-spermatozoid-when-it-escapes-from-the-antheridium-disappears-completely-in-species-where-the-period-quotof-activity-is-prolonged-thus-in-gymnogramme-mertensii-the-swarm-period-lasted-about-two-hours-and-during-this-time-the-starch-disappeared-completely-fertilisation-i-shaw-2-has-made-a-careful-study-of-the-fertilisation-in-struthioptcris-and-in-onoclea-he-states-that-b-PG0CK4.jpg ". The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 320 MOSSES AND FERNS lirBuller also showed that the starch which is usually present in "the vesicle of the spermatozoid, when it escapes from the antheridium, disappears completely in species where the period "of -activity is prolonged. Thus in Gymnogramme Mertensii, â¢the swarm-period lasted about two hours, and during this time the starch disappeared completely. Fertilisation i Shaw (2) has made a careful study of the fertilisation in Struthioptcris and in Onoclea. He states that b Stock Photo")
RMPG0CK4–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 320 MOSSES AND FERNS lirBuller also showed that the starch which is usually present in "the vesicle of the spermatozoid, when it escapes from the antheridium, disappears completely in species where the period "of -activity is prolonged. Thus in Gymnogramme Mertensii, â¢the swarm-period lasted about two hours, and during this time the starch disappeared completely. Fertilisation i Shaw (2) has made a careful study of the fertilisation in Struthioptcris and in Onoclea. He states that b
RMRDFCR0–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. VII PTERIDOPHYTA—FILICINE^—OPHIOGLOSSACEJE 237 from which the cover of the antheridium is formed. The outer wall of the antheridium remains for the most part but one cell thick, in tljis respect more resembling Marattia than it does Botrychium. The antheridium also opens by a single, nearly triangular opercular cell (Fig. 125, E), as it does in Marattia. The spermatozoids were not seen, but probably resemble those of Botrychium or Marattia. The first division of the young archegonium is the sa
RMPG431T–. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. T2r. Fig. 6i. Formation of oospores and processes of fertilisation in the Peronosporeae. IVI. Pythium facile. Suc- cessive states of an oogonium. / nuiturc oogonium; to tlie right of it is an antheridial branch formed but not yet delimited? // antheridium delimited by a transverse wall. /// the oospherc has rounded itself off in the oogonium, and a thin zone of periplasm lies between the oosphere and the wall of the oogonium. IV the antheridium has put out the fertil
RMRDX400–. Lectures on the evolution of plants. Botany; Plants. MOSSES AND LIVERWORTS 103. among the algse is found in the stoneworts (Characese), but the differences in the vegetative parts between these and the Hepaticse are too great to admit of the idea of any but the remotest relationship existing between the two, and at present it must be admitted that the gulf between Algse and Archegoniates is a very deep one. The antheridium is not so different from that of some algae, but is much more com- plicated than in any but the Characese. In the Archegoniates it has the form of a capsule (Fig. 26, C),
RMPG05TR–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 02 MOSSES AND FERNS CHAP. later showing a division into ventral and dorsal cells. Prob- ably this type has been derived from the former by a gradual increase in the size of the angle formed by the dorsal and ven- tral walls of the apical cell, which finally became so great as to practically form one plane. Th6 antheridium of Pellia is larger than that of Aneura, but its' development is very similar except that the stalk is multicellular, as it is in the; other An^crogynse. The sperma- tozoids
RMRE0RCG–. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. THE GAMETOPHYTE 29 In Ophioglossum the young archegonia may be found near the apex of the prothallial branch, but they may also arise at a considerable distance back of it. In general, Hke the antheridia, they arise in acropetal succession. The mother cell, like that of the antheridium, is sometimes broad, sometimes narrow and deep, and the cover cell is correspondingly shallow, or deep. The first division of the inner cell takes place shortly after the cover cell is cut off
RMPG4GW4–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 117 The oogonium after fertilization gives rise to a more or less complicated system of ascogenous hyphae, very simple in the Erysiphaceae, very complex in some Discomycetes, which produces the asci. The sterile parts of the ascocarp, the paraphyses and enveloping structures, arise from parts below the oogonium and antheridium. The very young ascus usually receives two nuclei from the parent strand of the ascogenous hypha. These nuclei unite giving the. Please note that these images are extracted
RMRDCT0D–. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAPTER V.—COMPARATIVE REVIEW ASCOMYCETES.—PYRONEMA. 209 embraces its apex and presses its obtuse extremity firmly against it. When this has taken place, seldom before, the tube is delimited by a firm transverse wall from the inflated portion of the archicarp, and, as soon as the wall is formed, the membrane in each of the connected organs is dissolved at the point of contact of the tube with the antheridium, and the protoplasmic bodies of the two organs unite togethe
RMPG0CK8–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 3i8 MOSSES AND FERNS CHAP. but after the antheridium is burst open, the two lower ones become so distended that they nearly fill the central cavity. The opening is effected either by a central rupture of the cover cell, or less commonly by a separation of this from the upper ring cell. The development of the archegonium is intimately connected with the apical growth of the large female prothallium. As soon as the single apical cell has been replaced by the marginal initials, the divisions in t
RMRDWGDJ–. Elementary botany. Botany. Vaucheria sessilis, one antheridium between two oogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. When these are formed the antherid- ium opens at the end and they escape. It is after the escape of these spermatozoids that the antheridium is collapsed. Each spermatozoid is a male gamete. 252. Oogonium.—The oogonia are short branches also, but they become large and , > somewhat oval. The / J septum which separates the protoplasm from that of the main thread is as we see near the junction of the branch with the main
RMPG4GWT–. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 75.—Sphsrotheca castagnei. Fertilization and de- velopment of the perithecium. Og= oogonium, an= antheridium, st= stalk-cell. 6 as the ascogonium derived from the oogonium. After Harper. short, innate; again they are long, loose or floccosc. They may emerge through stomata singly or in tufts or they may form sporo- genous cushions below the epidermis or again they may be borne inside of a hollow structure, the pycnidium, which covers them. Chlamydospores are also found. One or several distinct types of sporification may belong
RMRR22J1–. Our native ferns and their allies : with synoptical descriptions of the American Pteridophyta north of Mexico. Ferns. And Their Allies 33 coils.. At maturity the antheridium swells by the absorption of water and finally bursts its wall, dis- charging these coiled filaments which possess the power of locomotion, and for this reason are called antherozoids. These antherozoids often drag with them a little vesicle which seems to play no part in the process of repro- duction. (Fig. 24). 73. Archegonia. — The archego- nium (sometimes called pistillidium), is also a rounded mass of tissue usu- all
RMPG4CM9–. Diseases of truck crops and their control . Vegetables. Fig. 35. Radish Diseases. a. Young radishes attacked by Rheosporangium damping off, 6. presporangium, c mycelium of Rheosporangium aphanidermatum, d. fertilization of the female oogonium by the male antheridium, e. mature oospore, /. root knot {h. to e. after Edson).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Taubenhaus, Jacob Joseph, 1884-1937. New York : E. P
RMRDHRR8–. Fungi; their nature and uses. Fungi. 172 FUNGI. fecundation, should become the reproductive body, vegetable egg, or oospore. The gonosphere having been formed, the antheridium shoots out from the centre of its face, close against the oogonium, a straight tube, which perforates the walls of the female cell, and traversing the protoplasm of its periphery, directs itself to the gonosphere. It ceases to elongate itself as soon as it touches it, and the gonosphere becomes clothed with a membrane of cellulose, and takes a regular spheroidal form. Considering the great resemblance of these organs w
RMPG4569–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. HIGHER FUNGI 125 antheridium, which is cut o£E by a partition wall. The walls between the two orgjins are dissolved and the male nucleus passes through the opening formed wanders toward the egg nucleus with which it fuses. Immediately after fertilization, the oogonium begins steady growth, and some of the outer cells formed become the cover. Fig. 39.—Diagrammatic representation of the development of the ascogenous hyphal system. {After Claassen.) cells of the perithecium. But ascogenous
RMRE2FY9–. Fundamentals of botany. Botany. 214 STRUCTURE AND LITE HISTORIES their location and mode of origin, the antheridia of some of the lower, or eusporangiate, ferns, such as Ophioglosum and Botrychium. The archegonia are also imbedded, with the tip of the neck reaching to the surface (Fig. 159). They are further concealed at maturity by the growth of. Fig. 158.—Cross-section of the thallus of a hornwort {Anthoceras Sp.). The oval area is an antheridium, containing sperms, or sperm-inother- cells.. Please note that these images are extracted from scanned page images that may have been digitally e
RMPG41KK–. Elements of botany. Botany; Botany. 238 ELEMENTS OF BOTANY. Pry off this lid, remove some of the mass of spores from the interior of the urn, observe their color as seen in bulk through the magnifying glass, then mount in water, examine with the highest obtainable power of the microscope and sketch them. These spores, if sown on moist earth, will each develop into a slender, branched organism, consisting, like pondscum, of single rows of cells, Fig. 206, called the protonema.. Fig. 205. — Longitudinal Section of the Summit of a very Small Antheridium- Bearing Plant of Funaria hi/grometrica,
RMRR22HM–. Our native ferns and their allies : with synoptical descriptions of the American Pteridophyta north of Mexico. Ferns. At maturity the antheridium swells by the absorption of water and finally bursts its wall, dis- charging these coiled filaments which possess the power of locomotion, and for this reason are called antherozoids. These antherozoids often drag with them a little vesicle which seems to play no part in the process of repro- duction. (Fig. 24). 73. Archegonia. — The archego- nium (sometimes called pistillidium), is also a rounded mass of tissue usu- ally less prominent than the an
RMPG41D1–. Foundations of botany. Botany; Botany. TYPES or CRYPTOGAMS ; BKYOPHYTES 279. Pig. 203. — Section tlirough Anther- idial Keceptacle of Marchmitia. (Magnified.) a, antheridium. 337. Internal Structure. — Cut thin cross-sections of the thallus in the same way as for Physcia, making some pass through the cir- cular dots mentioned above. Exam- ine under a high power and note the different kinds and layers of cells composing the thallus. Note the character of the cells forming the upper and lower surfaces. Describe the cells which are next above those of the lower epidermis, their shape, color of
RMRDF34W–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. ISO MOSSES AND FERNS CHAP. The full-grown antheridium is mot-e flattened than in either species of Anthoceros examined by me, and the stalk shorter and thicker, but otherwise closely resembles it, although the extremely symmetrical arrangement of the cells, especially of the wall, is much less noticeable. The archegonia correspond very closely, both in position and structure, with those of the other genera, the most marked peculiarity being the more nearly equal diameter of the cover cell and
RMPG41C0–. Foundations of botany. Botany; Botany. 284 FOtnSDATIONS OF BOTAlTir any of the smaller genera,^ and •work out what he can in regard to their minute anatomy.. Fig. 208.—The Antheridinm ' of a Moss (FwnaHa) and its Contents. a, antheridium; b, escaping antherozolds, x 350; c, asin- gle antherozoid of another moss, X 800.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood,
RMRDF2AC–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. XI LEPTOSPORANGIAT^ HETEROSPOREM 421 four hours for its completion. Pilularia approaches much nearer to the Polypodiaceas in the structure of the antheridium (Fig. 246). The first funnel-shaped wall is much more frequently extended to the basal wall, and the two groups of sperm cells are much less distinct than in Marsilia. The spermatqzoids of Marsilia are at once distinguished by a great number of coils, sometimes thirteen or fourteen in M. vestita. The cilia are very numerous, but are attac
![. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 77. Fig. 47.—^P. citriophora; de- velopment of swarmsporea from sporangia. After Smith and Smith. and the contents of the antheridium are carried over to the egg by a fertilizing tube. Members of the genus are aggressively parasitic only under most favorable environmental conditions of heat an(f moisture. Some sixteen species are known. P. de baryanum Hesse, is most com- mon''"'' as the cause of "Damping Off." Zoosporangia or "conidia" globose to eUiptic, usually papillat Stock Photo](https://c8.alamy.com/comp/PG4H36/the-fungi-which-cause-plant-disease-plant-diseases-fungi-the-fungi-which-cause-plant-disease-77-fig-47p-citriophora-de-velopment-of-swarmsporea-from-sporangia-after-smith-and-smith-and-the-contents-of-the-antheridium-are-carried-over-to-the-egg-by-a-fertilizing-tube-members-of-the-genus-are-aggressively-parasitic-only-under-most-favorable-environmental-conditions-of-heat-anf-moisture-some-sixteen-species-are-known-p-de-baryanum-hesse-is-most-com-monquot-as-the-cause-of-quotdamping-offquot-zoosporangia-or-quotconidiaquot-globose-to-euiptic-usually-papillat-PG4H36.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 77. Fig. 47.—^P. citriophora; de- velopment of swarmsporea from sporangia. After Smith and Smith. and the contents of the antheridium are carried over to the egg by a fertilizing tube. Members of the genus are aggressively parasitic only under most favorable environmental conditions of heat an(f moisture. Some sixteen species are known. P. de baryanum Hesse, is most com- mon''"'' as the cause of "Damping Off." Zoosporangia or "conidia" globose to eUiptic, usually papillat Stock Photo")
RMPG4H36–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 77. Fig. 47.—^P. citriophora; de- velopment of swarmsporea from sporangia. After Smith and Smith. and the contents of the antheridium are carried over to the egg by a fertilizing tube. Members of the genus are aggressively parasitic only under most favorable environmental conditions of heat an(f moisture. Some sixteen species are known. P. de baryanum Hesse, is most com- mon''"'' as the cause of "Damping Off." Zoosporangia or "conidia" globose to eUiptic, usually papillat
RMRDF3DT–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE JUNGERMANNIALES 8i antheridium body (Fig. 33, D). At this stage and the one preceding it Sphcerocarpus recalls the structure of the anther- idium of the Characeas, although the succession of walls is not exactly the same. The divisions of the central cells are ex- tremely regular, walls being formed at right angles, so that the sperm cells are almost perfectly cubical, and the limits of the primary central cells are recognisable for a long time. The development of the antheridial envelope
RMPG0513–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MOSSES AND FERNS CHAP. a nearer connection of these two groups than is usually admitted. As in the eusporangiate Ferns, the antheridium mother cell is divided into an inner and an outer cell of which the inner one forms at once the sperm cells. When the antheridium arises at' the end of a filament, the divisions in the terminal cell are very much like those in Osmunda. In the mother cell three intersect- ing walls enclose a tetrahedral cell, which then has the cover cell cut ofif by a periclin
RMRDW8E0–. An introduction to vegetable physiology. Plant physiology. EBPEODUCTION 4B9 be illustrated by studying a series of forms. The earliest indication of it, which we can find, is exhibited by the HydwpteridecB, of which Salvinia is a characteristic type. Salvinia is a heterosporous form, each microspore of which gives rise to a very rudimentary prothallium bearing only one antheridium with four antherozoids (fig. 175). The megaspore, like the microspore, is hberated from the sporangium, and on germination it produces a prothallium, part of which remains in the spore and part protrudes from it (f
RMPG1Y64–. Lectures on the evolution of plants. Botany; Plants. Fig. 12.—Vaucheria sessilis, one of the fresh-water Siphonese; A, plant with unopened antheridium, an, and oogo- nium, og; B, an older plant with the antheridium empty, and the oogonium containing the resting-spore, sp; C, the end of a filament with a zoosporangium; D, zoospore showing the pairs of cilia corresponding to the individual nuclei in its outer part; E, a germinating zoospore.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
RMRDWFM5–. Elementary botany. Botany. tered over this portion of the prothallium theridia. If the pro- thallia have not been watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridium, for when the prothallia .. ., ... , ls'.223' ,, r Section or anthendia showing sperm cells, and spermato- are freshly placed in zoids in the one at the risht- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and all the spermatozoids are shot out. We can see here
RMPG4GX5–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 115 reproductive structures in the form of conidia. These may be borne singly or in rows on simple or branched conidiophores. The conidiophores may be single or variously grouped in columns or layers. Figs. 352, 378, 382. In some instances they are very. Fig. 75.—Sphsrotheca castagnei. Fertilization and de- velopment of the perithecium. Og= oogonium, an= antheridium, st= stalk-cell. 6 as the ascogonium derived from the oogonium. After Harper. short, innate; again they are long, loose or floccosc.
![. Elementary botany. Botany. tered over this portion of the prothalhum. These are the an- theridia. If the pro- thallia have not been ^^^ .^ / watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridiura, for when the prothalha <, ,. , ,^ . ,. p^:'"'- „ , ^ bection or anthendia showing sperm cells, and spermato- are freshly placed in ™'<'= ™ "^= °"^ "gi"- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and Stock Photo](https://c8.alamy.com/comp/RE0P0G/elementary-botany-botany-tered-over-this-portion-of-the-prothalhum-these-are-the-an-theridia-if-the-pro-thallia-have-not-been-watered-for-a-day-or-so-we-may-have-an-opportunity-of-see-ing-the-spermato-zoids-coming-out-of-the-antheridiura-for-when-the-prothalha-lt-pquot-bection-or-anthendia-showing-sperm-cells-and-spermato-are-freshly-placed-in-lt=-quot=-quot-quotgiquot-water-the-cells-of-the-antheridium-ab-sorb-water-this-presses-on-the-con-tents-of-the-antheridium-and-bursts-the-cap-cell-if-the-antheridium-is-ripe-and-RE0P0G.jpg ". Elementary botany. Botany. tered over this portion of the prothalhum. These are the an- theridia. If the pro- thallia have not been ^^^ .^ / watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridiura, for when the prothalha <, ,. , ,^ . ,. p^:'"'- „ , ^ bection or anthendia showing sperm cells, and spermato- are freshly placed in ™'<'= ™ "^= °"^ "gi"- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and Stock Photo")
RMRE0P0G–. Elementary botany. Botany. tered over this portion of the prothalhum. These are the an- theridia. If the pro- thallia have not been ^^^ .^ / watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridiura, for when the prothalha <, ,. , ,^ . ,. p^:'"'- „ , ^ bection or anthendia showing sperm cells, and spermato- are freshly placed in ™'<'= ™ "^= °"^ "gi"- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and
RMPG05DR–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 240 MOSSES AND FERNS CHAP. Still later the archegonia appear along the base of the anther- idial ridge (Fig. 126, B). The development of the antheridium (Fig. 128) is much like that of Ophioglossum, but the outer wall of the antheridium has normally two layers of cells. The spermatozoids, accord- ing to Jeffrey, probably correspond with those of the true Ferns. In a few cases observed by myself (Fig. 128, C) the primary division walls of the central part of the antheridium were not broken down
RMRDWG4K–. Nature and development of plants. Botany. 220 REPRODUCTION OF A WATER MOULD the gametes is perhaps due to their exposure to atmospheric conditions,. as would be the case when growing upon terrestrial or floating organic matter. The lack of water for the transport of the male gametes is nicely met by a tubular outgrowth of the antheridium which penetrates the oogonium when it ruptures, discharging the male close to the female gametes (Fig. 130, D, an). In the majority of the species, singularly enough, the female gametes germinate without being fertilized. The gametospore germinates as in Vau
RMPG00XA–. Lessons in botany. Botany. F,g. i 9. Section of antheridial receptacle from male plant of Marchantia polymorpha, showing cavities where the antheridia are borne. 237. Archegonial plants.—In fig. 122 we see one of the female plants of marchantia. Upon this there are also very curious structures, which remind one of miniature umbrellas.. Fig. 120. Section of antheridium of mar- chantia, showing the groups of sperm mother cells. Fig. 121. Spermatozoids of marchantia, uncoiling and one extended, showing the two cilia. The general plan of the archegonial receptacle is similar to that 01 the anthe
RMRDXT8M–. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 206 MANUAL OF POISONOUS PLANTS side of the oogonium; the antheridium. This pierces the oogonium and the protoplasm of the antheridium passes into the oosphere. In the species that have been studied like Peronospora parasitica, and Al- bugo Candida, the oosphere or egg cell contains a single nucleus, situated about at the center, the remaining nuclei having passed into the peripheral layer of the protoplasm of the periplasm. A single
RMPG41D4–. Essentials of botany. Botany; Botany. Fie. 192. Section through An- theridial Eeceptaole of Mar- chantia. (Magnified.) a, antheridium. (f) The female receptacles, stalked structures with finger-like re- curved arms radiating from the center. With the magnifying glass examine the under surface of a very mature receptacle and note the young sporophytes, or spore-plants, hanging from the receptacle. Draw. 344. Minute Structure of Thallus and Buds. — Cut thin cross-sections of the thallus and examine with l.p. and then with m.p. Note : (a) The general structure of the thallus, with a firm upper
RMRE2NCF–. Elementary botany. Botany. Fig. 140. Vaucheria sessilis, one antheridium between twn rtogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. Wlien these are formed the antherid- ium opens at the end and they escape. It is after the escape of these spermatozoids that the antheridium is collapsed. Each spermatozoid is a male gamete. 304. Oogoniiim.âThe oogonia are short branches also, but they become large and , > somewhat oval. The / * septum which separates the protoplasm from that of the main thread is as we see near the junction of the branch
RMPG2M56–. Parasitic fungi of Illinois / by T.J. Burrill. Fungi. Parasitic Fungi of Illinois. 389 these swells to two or three times the diameter of the thread, and is separated from it by a transverse partition. It now con- stitutes the carpogonium, homologous with the pistil of the flowering plants. The other branch, the antheridium, remains cylindrical, and is closely applied to the carpogonium, bending over its summit. A septum is formed near the tip, dividing off a small cell, whose contents, passing into the carpogonium, effect its fertilization. Slender branches now arise on all sides from near
RMRDHG2X–. Plant studies; an elementary botany. Botany. 304 I'LAXT STUDIES IDS. The antheridium.—The male orgun of the Br^yophytes is called an antheridium, just as among Thalloi^hytes, but it has a very diflt'oreut structure. In general among the. iSri^^ftjSffe .. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
RMPG05NA–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. IV. THE ANTHOCEROTES 129 arise is the inner of two cells formed by a transverse wall in a surface cell. The outer cell (see Figure 67, B) divides almost immediately by another wall parallel with the first, so that the group of antheridia is separated by two layers of cells from the surface of the thallus. The inner cell in A. Pearsoni at once develops into an antheridium; but in most species the cell divides first by a longitudinal wall into two, each of which. Fig, 67.—Anthoceros Pearsoni. De
![. Elementary botany. Botany. tered over this portion of the prothalhum. These are the an- theridia. If the pro- thallia have not been ^^^ .^ / watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridiura, for when the prothalha <, ,. , ,^ . ,. p^:'"'- „ , ^ bection or anthendia showing sperm cells, and spermato- are freshly placed in ™'<'= ™ "^= °"^ "gi"- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and Stock Photo](https://c8.alamy.com/comp/RE0P0D/elementary-botany-botany-tered-over-this-portion-of-the-prothalhum-these-are-the-an-theridia-if-the-pro-thallia-have-not-been-watered-for-a-day-or-so-we-may-have-an-opportunity-of-see-ing-the-spermato-zoids-coming-out-of-the-antheridiura-for-when-the-prothalha-lt-pquot-bection-or-anthendia-showing-sperm-cells-and-spermato-are-freshly-placed-in-lt=-quot=-quot-quotgiquot-water-the-cells-of-the-antheridium-ab-sorb-water-this-presses-on-the-con-tents-of-the-antheridium-and-bursts-the-cap-cell-if-the-antheridium-is-ripe-and-RE0P0D.jpg ". Elementary botany. Botany. tered over this portion of the prothalhum. These are the an- theridia. If the pro- thallia have not been ^^^ .^ / watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridiura, for when the prothalha <, ,. , ,^ . ,. p^:'"'- „ , ^ bection or anthendia showing sperm cells, and spermato- are freshly placed in ™'<'= ™ "^= °"^ "gi"- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and Stock Photo")
RMRE0P0D–. Elementary botany. Botany. tered over this portion of the prothalhum. These are the an- theridia. If the pro- thallia have not been ^^^ .^ / watered for a day or so, we may have an opportunity of see- ing the spermato- zoids coming out of the antheridiura, for when the prothalha <, ,. , ,^ . ,. p^:'"'- „ , ^ bection or anthendia showing sperm cells, and spermato- are freshly placed in ™'<'= ™ "^= °"^ "gi"- water the cells of the antheridium ab- sorb water. This presses on the con- tents of the antheridium and bursts the cap cell if the antheridium is ripe, and
RMPG4GH0–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 173 This binucleate cell after fusion of its nuclei develops into the one ascus characteristic of the genus. The ascus nucleus by- division gives rise to the spore nuclei and the spores are cut out of the periplasm by reflexion of the astral rays. In Erysiphe** the oogonium and antheridium arise in a very similar way, the oogonium being somewhat curved. Feri;ilization is also similar consisting of the union of two gametic nuclei. After fertilization the oospore nucleus divides and the oogonium de
RMRPXNXP–. Text-book of botany, morphological and physiological. Botany. FIG. xZ^.—Herpotkamnion. kermaphroditum. A a branch with a carpogoniumy and an antheridium an. B the mature cystocarp after fertilisation (after Niigeli). (Fig. 190) the carpogonium is also multicellular, and it is from its central cell that the spores are developed, whilst the outer cells grow out into filaments forming a closed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble th
RMPG1JR1–. The British Charophyta. Characeae. STRUCTURE AND DEVELOPMENT. 49 to four) of long whip-like filaments (c). The filaments are divided by transverse septa into about 100 to 200 disc-shaped cells, each of which contains an antherozoid. The number of antherozoids produced by a single antheridium has been computed at 20,000 to 30,000. The filaments form a dense tangled mass in the centre of the antheridium. A careful study of the development of the anthero-. JPia. 20.—Development of antherozoids (after Guignard). i. Early- stage after nucleus has moved to one side of cell. ii. Later stage showing
RMRDX40A–. Lectures on the evolution of plants. Botany; Plants. THE FUNGI 91. arrangement; but in all the higher ones they are borne in definite spore-fruits of characteristic form. This spore- fruit is undoubtedly, in many instances, the result of fertilization, being pro- duced by the formation of a peculiar cell, the archi- carp, which corresponds to the oogonium of the Phy- comycetes. This is usually fertilized by direct contact with the antheridium, and from it, more or less di- rectly, are produced the spore-sacs or asci. A good example of these simpler Ascomycetes is offered by the mildews which
RMPG4A3M–. Foundations of botany. Botany; Botany. THE EVOLUTIONARY HISTORY OF PLANTS 303 â¢â a development the macrospore produces an endosperm whicli is really a small cellular prothallium, concealed in the ovule. The microspore contains vestiges of a minute prothallium. In the angiosperms the macrospore and its prothallium are still less developed, and the microspore, or pollen grain, has lost all traces of a prothallium and is merely an antheridium which contains two generative ceUs.^ These are most easily seen in the pollen grain, but sometimes they are plainly visi- ble in the pollen tube (Fig. 16
RMRDYFEF–. A textbook of botany for colleges and universities ... Botany. 136 MORPHOLOGY vegetative tissue of more primitive gametophytes. The antheridium initial produces an antheridium with the usual jacket of sterile cells investing sperm mother cells (fig. 306). At maturity the jacket cells break down and the mother cells (with their sperms) are free in the general cavity of the microspore (fig. 307). The male gameto- phyte, therefore, is reduced to one vegetative cell and one anthe- ridium ; and encased by the old microspore wall it is carried to the megasporangium, in which the female gametophjrt
![. Essentials of botany. Botany; Botany. Fig. 158. End of a Main Shoot of a Stonewort, Chara. (About natural size.) Fig. 159. Part of a "Leaf" of Fig. 158. (Considerably magnified.) u, antheridium; u, oogonium. At the right are a young antheridium and archegonium. This plant is a familiar object, waving as it does from rocks, piles, and wharves alongshore. Terrestrial genera and species of green algge are not uncommon.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr Stock Photo](https://c8.alamy.com/comp/PG0R4H/essentials-of-botany-botany-botany-fig-158-end-of-a-main-shoot-of-a-stonewort-chara-about-natural-size-fig-159-part-of-a-quotleafquot-of-fig-158-considerably-magnified-u-antheridium-u-oogonium-at-the-right-are-a-young-antheridium-and-archegonium-this-plant-is-a-familiar-object-waving-as-it-does-from-rocks-piles-and-wharves-alongshore-terrestrial-genera-and-species-of-green-algge-are-not-uncommon-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustr-PG0R4H.jpg ". Essentials of botany. Botany; Botany. Fig. 158. End of a Main Shoot of a Stonewort, Chara. (About natural size.) Fig. 159. Part of a "Leaf" of Fig. 158. (Considerably magnified.) u, antheridium; u, oogonium. At the right are a young antheridium and archegonium. This plant is a familiar object, waving as it does from rocks, piles, and wharves alongshore. Terrestrial genera and species of green algge are not uncommon.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr Stock Photo")
RMPG0R4H–. Essentials of botany. Botany; Botany. Fig. 158. End of a Main Shoot of a Stonewort, Chara. (About natural size.) Fig. 159. Part of a "Leaf" of Fig. 158. (Considerably magnified.) u, antheridium; u, oogonium. At the right are a young antheridium and archegonium. This plant is a familiar object, waving as it does from rocks, piles, and wharves alongshore. Terrestrial genera and species of green algge are not uncommon.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr
RMRDTP60–. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. 84 PLECTOMYCETES [CH. de Bary, who was able to recognize an antheridium and oogonium and the formation of an ascus or asci from the latter. These and several subsequent investigations have rendered the reproductive processes in the Erysiphaceae better known than perhaps in any other group of fungi. Sphaerotheca Humuli^ occurs on a variety of common plants, on the cultivated strawberry, where it is responsible for strawberry mildew, and especially on the hop. On the latter it is widely distributed in autumn, and, if the female inflorescenc
Search Results for Antheridium Black & White Stock Photos and Images (379)
Page 1 of 4