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Research Interests: Geography, Argentina, Ecology, Protected areas, Buenos Aires, and 11 moreFerns and Fern Allies, Flora and Vegetation, DIVERSIDAD, Ciencias Biológicas, Threatened Species, Protected Areas, Buenos AIres, Helechos, Conservación De La Biodiversidad, Enseñanza - Aprendizaje Ciencias Naturales Y Exactas, and Revista de Biología Tropical
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Research Interests: Geography and Humanities
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Se realiza un análisis morfológico de la familia de helechos Lindsaeaceae en la Argentina, y se actualizan los datos de su distribución. A partir de la rectificación de información previa debida a citas no corroboradas y erróneas... more
Se realiza un análisis morfológico de la familia de helechos Lindsaeaceae en la Argentina, y se actualizan los datos de su distribución. A partir de la rectificación de información previa debida a citas no corroboradas y erróneas determinaciones se confirma la presencia de un único taxón en el país: Lindsaea quadrangularis subsp. terminalis. Se provee una descripción morfológica detallada, consideraciones sobre el hábitat, notas relevantes, ilustraciones, fotografías y un mapa de distribución de la especie en el área de estudio. Se elabora una clave para identificar las especies del género Lindsaea para la Argentina y áreas limítrofes de Brasil.A morphological analysis of the fern family Lindsaeaceae from Argentina is carried out and distributional data updated. After the rectification of previous information due to citations uncorroborated and erroneous determinations the presence of a single taxon is confirmed in the country: Lindsaea quadrangularis subsp. terminalis . A detailed ...
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FIGURE 1. Hypolepis stolonifera var. delasotae. A. Habit. B. Abaxial surface of a segment. Scale bar: A = 20 cm; B = 0.3 cm.
The riparian forest is one of the most diverse environments of the La Plata River plains. It is represented by patches of humid forests, which are a valuable source of ecosystem services and have recreational and educational potential.... more
The riparian forest is one of the most diverse environments of the La Plata River plains. It is represented by patches of humid forests, which are a valuable source of ecosystem services and have recreational and educational potential. However, the riparian forest has undergone constant modification, worsened by private real-estate developments and a lack of government regulation. Among the reserves that protect the riparian forest, the Municipal Ecological Reserve of Avellaneda is the closest to the southern limit of the Autonomous City of Buenos Aires. Although there are around 300 species of wild fauna and flora informally registered in the area, there are only a few studies published about its biodiversity. In this work, the diversity of thirteen native and exotic ferns in the core area (Eco Área) of the reserve is characterized, the origin of the species is also evaluated and comparisons are made with other nearby protected areas. The Eco Área of the Reserve plays an important ...
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En este trabajo se cita por primera vez a Megalastrum substrigosum para Argentina, en el departamento de San Pedro, provincia de Misiones. Se presenta una descripción general de la especie, el mapa de su distribución en el país e... more
En este trabajo se cita por primera vez a Megalastrum substrigosum para Argentina, en el departamento de San Pedro, provincia de Misiones. Se presenta una descripción general de la especie, el mapa de su distribución en el país e ilustraciones sobre los caracteres más importantes para su determinación. Se incluye una clave dicotómica para diferenciar las tres especies presentes en Misiones.About the presence of Megalastrum substrigosum (Dryopteridaceae) in Argentina. This paper presents the first record of Megalastrum substrigosum from Argentina, in Department San Pedro, Misiones province. We present a description of the species, a distribution map, and illustrations of the diagnostic characters. A dichotomous key is included to differentiate the three Megalastrum species from Misiones.Facultad de Ciencias Naturales y Muse
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Currently, in Argentina 368 species of true ferns (i.e. Polypodiopsida class) are distributed throughout the country, however, only four of them have been mentioned until now as weeds and ruderal species. The goal of this work was to... more
Currently, in Argentina 368 species of true ferns (i.e. Polypodiopsida class) are distributed throughout the country, however, only four of them have been mentioned until now as weeds and ruderal species. The goal of this work was to generate an update of weedy ferns from Argentina, including morphology, distribution, and type of weed according to their impact on natural habitats and/or human activities. All Argentinian fern species were analyzed based on references, herbarium specimens, and field trips. As a result of our study 25 species were recorded from Argentina and classified as segetal, ecological, or aquatic weeds, and ruderal and/or toxic species. Current taxonomic identity, diagnostic characters, origins, habitats, geographical distribution, common names, and impact and potential risks were indicated by species. In addition, we provide a dichotomous key to species, presence of these species in southern South American countries, as well as and photographs in natural habita...
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Se cita por primera vez para Argentina Asplenium uniseriale Raddi coleccionada en el Parque Provincial Moconá, Misiones. De esta manera se extiende su área de distribución hacia el sur. Se registra la novedad de su hábito epífito sobre el... more
Se cita por primera vez para Argentina Asplenium uniseriale Raddi coleccionada en el Parque Provincial Moconá, Misiones. De esta manera se extiende su área de distribución hacia el sur. Se registra la novedad de su hábito epífito sobre el rizoma del helecho arborescente Alsophila setosa Kaulf. Se propone una clave para diferenciarla de especies misioneras del mismo género con una complejidad de la lámina similar.Asplenium uniseriale Raddi is recorded for the first time for Argentina. It was collected in Moconá Provincial Park (Misiones), therefore extending its range southward. The novelty of its epiphytic habit on the tree fern Alsophila setosa Kaulf rhizome is recorded. A key to differentiate species of the same genus with a complexity similar blade is proposed.Fil: Yañez, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedr...
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Se cita por primera vez para la flora argentina a Dennstaedtia dissecta, hallada en la provincia de Misiones. Este nuevo registro surgió del estudio de ejemplares de los herbarios BA y LP, y luego se corroboró con colecciones realizadas... more
Se cita por primera vez para la flora argentina a Dennstaedtia dissecta, hallada en la provincia de Misiones. Este nuevo registro surgió del estudio de ejemplares de los herbarios BA y LP, y luego se corroboró con colecciones realizadas en los Parques Provinciales Cruce Caballero y Urugua-í. Además de las características del rizoma y la lámina, las esporas resultaron una importante fuente de información en la identificación de esta especie. Se describen e ilustran los caracteres diagnósticos, y se incluye una clave para identificar a las especies de Dennstaedtia presentes en Misiones.Dennstaedtia dissecta is recorded for the first time for the Argentinean flora in the Misiones Province. This new record was discovered during the study of herbarium specimens from BA and LP, and then corroborated with field collections from Cruce Caballero Provincial Park and Urugua-í Provincial Park. In addition to the characteristics of rhizome and lamina, the spores were an important information sou...
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Key to the taxa of <i>Hypolepis</i> in Argentina 1. Laminae deltoid to triangular, basal pinnae equilateral, pseudoindusia absent or, if present, not ciliate......................................... 2 - Laminae rhombic, basal... more
Key to the taxa of <i>Hypolepis</i> in Argentina 1. Laminae deltoid to triangular, basal pinnae equilateral, pseudoindusia absent or, if present, not ciliate......................................... 2 - Laminae rhombic, basal pinnae strongly inequilateral, pseudoindusia ciliate................................................................................. 3 2. Rachises, costa and costules with capitate, glandular catenate hairs, pinnules with rounded lobes at the margin......................................................................................................................................................................................................... <i>Hypolepis poeppigii</i> - Rachises, costae and costules with acicular (non capitate) and glandular catenate hairs, pinnules with acute lobes at the margin.............................................................................................................................................
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Plantas terrestres o saxícolas, erectas o escandentes en la vegetación circundante. Rizoma largamente rastrero, a menudo sifonostélico o polistélico, con pelos articulados. Pecíolos a menudo con uno a varios haces vasculares dispuestos en... more
Plantas terrestres o saxícolas, erectas o escandentes en la vegetación circundante. Rizoma largamente rastrero, a menudo sifonostélico o polistélico, con pelos articulados. Pecíolos a menudo con uno a varios haces vasculares dispuestos en U y yemas epipeciolares que originan raíces. Láminas de gran tamaño, pinnadas a 4-pinnado-pinnatífidas, generalmente pilosas; venas libres, bifurcadas o pinnadas, raramente anastomosadas, nunca con venas inclusas. Raquis en general surcado en el dorso y piloso. Soros marginales o submarginales, circulares, naciendo en el extremo de las venillas o sobre una nervadura colectora marginal y, en este caso, constituyendo cenosoros cubiertos por indusios de diversas formas o por el margen reflexo de la lámina que puede estar más o menos modificado. Esporas triletes tetraédricas o monoletes reniformes, con diversos tipos de ornamentación. Gametofito cordado, verde.Fil: Yañez, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Arana, Marcelo Daniel. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Ciencias Naturales; Argentin
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Los cáudices de los helechos arborescentes presentan condiciones particulares que favorecen el establecimiento de epífitas. En este trabajo se estudiaron los helechos que crecen sobre Alsophila setosa (Cyatheaceae, Pteridophyta) en la... more
Los cáudices de los helechos arborescentes presentan condiciones particulares que favorecen el establecimiento de epífitas. En este trabajo se estudiaron los helechos que crecen sobre Alsophila setosa (Cyatheaceae, Pteridophyta) en la provincia de Misiones. Se encontraron 21 especies, que se agruparon en 10 géneros y 5 familias. La familia más diversa fue Polypodiaceae, con 8 especies, y los géneros mejor representados fueron Asplenium (6) y Pecluma (4). Se presenta una clave para la identificación de los taxa involucrados. La gran cantidad de especies encontradas refleja la importancia de Alsophila setosa como reservorio de diversidad biológica en el bosque atlántico.Trunks of tree ferns offer especially distinctive substrates to support epiphytes. In this paper, ferns that grow on Alsophila setosa Kaulf. from Misiones were studied. A total of 21 species, from 10 genera and 5 families, were recorded. Polypodiaceae (8) had greater specific diversity. Richest genera were Asplenium (6...
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FIGURE 4. Dennstaedtia globulifera. A. Geographical distribution of the species in Argentina (■ = location of the studied populations). B. Rhizome pubescent with ventral roots and pecioles without petiolar buds. C. Pinnulae lanceate,... more
FIGURE 4. Dennstaedtia globulifera. A. Geographical distribution of the species in Argentina (■ = location of the studied populations). B. Rhizome pubescent with ventral roots and pecioles without petiolar buds. C. Pinnulae lanceate, peciolulate. D. Segments of basal pinnula showing sori borning in a sinus between lobes. E. Detail of pinna that show costule bordered on each side by an herbaceous wing. The wing on the basiscopic side decurrent onto the axis of the next order. F. Spore with MEB, polar distal view. Ornamentation verrucate-lomate, with broad ridges fused in reticles. G–I. Spores with MO in polar distal view (G), polar proximal view (H) and ecuatorial view (I). The spores are brown and the reticles are evident. Scale bars: B y C = 2 cm; D = 1 cm; E = 0.5 cm; F = 5µm; G–I = 10µm. B–I from Yañez & Marquez 86 (LP).
FIGURE 3. Dennstaedtia glauca. A. Geographical distribution of the species in Argentina (x = location of the studied populations). B. Rhizome pubescent and pecioles without petiolar buds. C. Pinnulae lanceolate, peciolulate. D. Detail of... more
FIGURE 3. Dennstaedtia glauca. A. Geographical distribution of the species in Argentina (x = location of the studied populations). B. Rhizome pubescent and pecioles without petiolar buds. C. Pinnulae lanceolate, peciolulate. D. Detail of proximal segments that show terminal sori on lobes. E–G. Spores with MO in equatorial view (E), polar distal view (F) and polar proximal view (G). The spores are brown and ornamentation is not evident. H. Spore with SEM, polar distal view. Ornamentation verrucate-reticulate, with irregular verrucae distributed at random and irregular open reticule. Spore with SEM. Detail of ornamentation. Scale bars: B–C = 1 cm; D = 0.5 cm; E–G = 10µm. H= 10 µm. I= 2 µm. B–H from de la Sota 3054 (LP).
FIGURE 2. Dennstaedtia dissecta. A. Geographical distribution of the species in Argentina (▲ = location of studied populations). B. Pinnules lanceolate, sessile. C. Segments of basal pinnula, with crenate-rounded apex, that shows the sori... more
FIGURE 2. Dennstaedtia dissecta. A. Geographical distribution of the species in Argentina (▲ = location of studied populations). B. Pinnules lanceolate, sessile. C. Segments of basal pinnula, with crenate-rounded apex, that shows the sori borning in the sinuses of segment lobes. D. Pinnae showing basal pinnules reduced. E. Rhizome glabrous and rugged, with abundant lateral and ventral roots, and petioles with petiolar buds, bearing roots at the base. F. Spore with MEB, polar distal view. Ornamentation verrucate, with smooth verrucae and narrow ridges. G–I. Spores with MO in polar distal view (G), ecuatorial view (H) and polar proximal view (I). The spores are brown and the verrucae are evident. Scale bars: B, D y E = 2 cm; C = 1 cm; G = 5µm; F–I = 10 µm. B–E from Yañez & Marquez 104 (LP), F–I from Yañez & García 99 (LP).
FIGURE 1. Dennstaedtia cicutaria. A. Geographical distribution of the species in Argentina (● = location of the studied populations). B. Rhizome unbranched, pubescent and petioles with petiolar buds, bearing roots at the base. C. Pinnule... more
FIGURE 1. Dennstaedtia cicutaria. A. Geographical distribution of the species in Argentina (● = location of the studied populations). B. Rhizome unbranched, pubescent and petioles with petiolar buds, bearing roots at the base. C. Pinnule linearlanceolate, petiolate. D. Segments of basal pinnula, pinnatisect, oblog-lanceolated, showing sori born in sinuses. E. Detail of pinna showing costule pubescent abaxially, without perpendicular herbaceous wings on the upper surface. F. Spore with MEB, polar proximal view. Ornamentation verrucate, the verrucae uniform, rounded, ornamented with rodlets. G–I. Spores with MO in polar proximal view (G), polar distal view (H) and ecuatorial view (I). The spores are dark-brown and the verrucae are evident. Scale bars: B and E = 2 cm; C = 3 cm; D = 1 cm; F–I = 10 µm. B–I from Rodriguez et al. 694 (LP).
FIGURE 5. A–B. Hypolepis poeppigii. A. Habit. B. Detail of segments with rounded lobes at the margin. C–D. Hypolepis rugosula subsp. poeppigiana C. Habit. D. Detail of pinnules abaxially. Scale bars: A and C = 50 cm; B = 2 cm; D = 10 cm.
FIGURE 2. Hypolepis stolonifera var. delasotae. A. Rhizome long-creeping, branched. B. Hairs of rhizome are catenate, acicular, yellowish brown to golden brown. C. Detail of rachis with two kinds of hairs: hairs catenate, brownish or... more
FIGURE 2. Hypolepis stolonifera var. delasotae. A. Rhizome long-creeping, branched. B. Hairs of rhizome are catenate, acicular, yellowish brown to golden brown. C. Detail of rachis with two kinds of hairs: hairs catenate, brownish or withish and hairs uni-cellular, withish or hyaline. D. Rachis golden brown to light brown, villose. E. Basal pinnae with strongly inequilateral proximal pinnules. F. Laminar tissue between the veins abaxially villose. G. Detail of last pinnules. Sori marginal often confluent at maturity. H. Pseudo-indusia conspicuous, proximally green, distally hyaline, membranaceous in the hyaline part, the margin ciliate. Scale bars: A = 4 cm; B = 0.3 cm; C = 10 cm; D and E = 0.5 cm; F = 4 cm; G = 2 cm; H and I = 0.2 cm.
FIGURE 3. Hypolepis stolonifera var. stolonifera. A. Rhizome long-creeping, branched. B. Distal Pinna. C. Detail of pinnule. D. Habit. E. Segment with laminar tissue between the veins abaxially glabrous. F. Detail of marginal sori.... more
FIGURE 3. Hypolepis stolonifera var. stolonifera. A. Rhizome long-creeping, branched. B. Distal Pinna. C. Detail of pinnule. D. Habit. E. Segment with laminar tissue between the veins abaxially glabrous. F. Detail of marginal sori. Pseudo-indusia membranaceous, the margins copiously ciliate. Scale bars: A and B = 5 cm; C = 2 cm; D = 50 cm; E and F = 0.2 cm.
FIGURE 6. Complete distribution map of Hypolepis poeppigii, H. rugosula subsp. poeppigiana, H. stolonifera var. delasotae and H. stolonifera var. stolonifera.
FIGURE 4. A–B. Spores of Hypolepis stolonifera var. delasotae. A. Proximal view at light microscope. B. Proximal view at scanning electron microscope. C–D. Spores of Hypolepis stolonifera var. stolonifera. C. Equatorial view at light... more
FIGURE 4. A–B. Spores of Hypolepis stolonifera var. delasotae. A. Proximal view at light microscope. B. Proximal view at scanning electron microscope. C–D. Spores of Hypolepis stolonifera var. stolonifera. C. Equatorial view at light microscope. D. Equatorial view at scanning electron microscope. Scale bar: A–D = 10 µm.
El cultivo in vitro de esporas y los aspectos reproductivos del helecho anual Anogramma chaerophylla (Pteridaceae). Anogramma chaerophylla pertenece a un género de helechos con esporofitos anuales y gametofitos potencialmente perennes. En... more
El cultivo in vitro de esporas y los aspectos reproductivos del helecho anual Anogramma chaerophylla (Pteridaceae). Anogramma chaerophylla pertenece a un género de helechos con esporofitos anuales y gametofitos potencialmente perennes. En el área de estudio, la Reserva Natural Punta Lara, la vegetación crece bajo estrés debido principalmente a la contaminación y la invasión de especies exóticas. Como parte de un proyecto de conservación de helechos que habitan en la provincia de Buenos Aires, los objetivos del trabajo fueron evaluar en Anogramma chaerophylla las condiciones para la germinación de esporas in-vitro y analizar las distintas etapas de su ciclo reproductivo. Las esporas fueron desinfectadas en solución 10 % de NaCIO durante distintos tiempos y sembradas luego en medio de cultivo Murashige – Skoog, sin agregado de sacarosa. Las cápsulas se incubaron con un fotoperíodo de 12 h luz/oscuridad y una temperatura de 22 (± 2) °C. A las dos semanas germinaron el 80% de las espora...
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En este trabajo se cita por primera vez a Megalastrum substrigosum para Argentina, en el departamento de San Pedro, provincia de Misiones. Se presenta una descripción general de la especie, el mapa de su distribución en el país e... more
En este trabajo se cita por primera vez a Megalastrum substrigosum para Argentina, en el departamento de San Pedro, provincia de Misiones. Se presenta una descripción general de la especie, el mapa de su distribución en el país e ilustraciones sobre los caracteres más importantes para su determinación. Se incluye una clave dicotómica para diferenciar las tres especies presentes en Misiones.
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Resumen São apresentados os resultados do levantamento florístico das angiospermas da APA Municipal do Rio Vermelho/Humboldt, localizada em área de Mata Atlântica no sul do Brasil. As coletas foram realizadas entre os anos de 2004 e 2017,... more
Resumen São apresentados os resultados do levantamento florístico das angiospermas da APA Municipal do Rio Vermelho/Humboldt, localizada em área de Mata Atlântica no sul do Brasil. As coletas foram realizadas entre os anos de 2004 e 2017, e a identificação das espécies foi baseada em consulta bibliográfica, comparação com acervos de herbários e auxílio de outros especialistas. Foram inventariadas 979 espécies, distribuídas em 134 famílias, com maior riqueza de Asteraceae (87 espécies), Orchidaceae (86), Solanaceae (58), Melastomataceae (51), Bromeliaceae, Fabaceae, Rubiaceae (cada uma com 37), Myrtaceae (34), Piperaceae (33), Cyperaceae e Poaceae (ambas com 18). Doze espécies estão classificadas como ameaçadas de extinção e 21 espécies são novas ocorrências para o estado de Santa Catarina. A elevada riqueza florística demonstra a importância da APA para a conservação da diversidade vegetal no sul do Brasil.
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Based on the morphological study of ca. 470 specimens and geographical studies, we here propose the recognition of six morphotypes within the South American Pteridium esculentum (= P. arachnoideum s.l., or P. aquilinum var. arachnoideum... more
Based on the morphological study of ca. 470 specimens and geographical studies, we here propose the recognition of six morphotypes within the South American Pteridium esculentum (= P. arachnoideum s.l., or P. aquilinum var. arachnoideum sensu Tryon, or P. esculentum subsp. arachnoideum sensu Thomson). Three of them are widely distributed and well-defined, and we regard them as subspecies of P. esculentum: P. esculentum subsp. arachnoideum s. str., P. esculentum subsp. campestre, comb. et stat. nov., and P. esculentum subsp. gryphus. The other three are more rare. One of these is a pedomorphic form of P. esculentum subsp. arachnoideum, which we name as P. esculentum subsp. arachnoideum var. paedomorficum, nom. nov. The other is a glabrous form of P. esculentum subsp. gryphus, which we name P. esculentum subsp. gryphus var. harpianum, var. nov. The third is a putative hybrid between P. esculentum subsp. arachnoideum and P. esculentum subsp. campestre. All six taxa are keyed, described...
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En el presente trabajo se estudió la morfología y ultraestructura de las esporas de las Dennstaedtiaceae de la Provincia Fitogeográfica Paranaense (extremo sur de Brasil, desde los faldeos occidentales de la Serra do Mar hasta el centro... more
En el presente trabajo se estudió la morfología y ultraestructura de las esporas de las Dennstaedtiaceae de la Provincia Fitogeográfica Paranaense (extremo sur de Brasil, desde los faldeos occidentales de la Serra do Mar hasta el centro de Río Grande do Sul, el extremo nordeste de la Argentina y el este de Paraguay). Para realizar este trabajo se utilizó material de herbario y fresco, coleccionado en viajes de campo. Se usaron diversas técnicas de fijación y tinciones diferenciales y las observaciones se realizaron con microscopio óptico (MO) y electrónico de barrido y de transmisión (MEB y MET). Dennstaedtiaceae es una familia de helechos ampliamente distribuida en el mundo, con representantes predominantemente pantropicales, ocasionalmente boreales y de regiones templadas. Desde el punto de vista morfológico, la familia incluye grupos muy diversos lo que ha dificultado la delimitación taxonómica de taxa subordinados a lo largo de la historia. Los caracteres reproductivos dentro de...
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The spore morphology and wall ultrastructure of Microlepia speluncae and Pteridium arachnoideum from the Paranaense Province were analyzed with LM, SEM and TEM and a comparative analysis was carried out. In both species the spores are... more
The spore morphology and wall ultrastructure of Microlepia speluncae and Pteridium arachnoideum from the Paranaense Province were analyzed with LM, SEM and TEM and a comparative analysis was carried out. In both species the spores are covered by a three-dimensional network of threads branched and fused, tangentially arranged to the surface, and some free-end threads are also seen. The species were differentiated by morphology and the frequency of threads fusion and the networks distribution on the surface of the spores. In both species the exospore is two-layered in section, both layers are traversed by single or branched channels. The perispore is three-layered in section: the inner layer is adhered to the exospore, the middle layer is formed of a three-dimensional network of threads and the outer layer is discontinuous. The perispore ultrastructure of Microlepia speluncae was interpreted as formed of helical subunits displayed around a central channel. The spore morphology and per...
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Abstract The spore morphology and wall structure of Dennstaedtia species from the Phytogeographic Paranaense Province: Dennstaedtia cicutaria, D. cornuta, D. dissecta, D. globulifera, D. obtusifolia were studied using light microscopy... more
Abstract The spore morphology and wall structure of Dennstaedtia species from the Phytogeographic Paranaense Province: Dennstaedtia cicutaria, D. cornuta, D. dissecta, D. globulifera, D. obtusifolia were studied using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The spores are trilete, brown, triangular in polar view and plane-hemispheric to plane-convex in equatorial view. The exospore is homogeneous, with two layers. The perispore has an alveolar structure and is composed of one or two layers. The outer perispore surface bears the sculpture, which has elements of varied shapes (verrucae, ridges, reticles), an different sizes and fusion. This variation allows characterize species or groups of species. Three different types of perispore ornamentation can be found: 1. Verrucate with verrucae covered with rodlets; 2. Verrucate-rugate with verrucae and smooth ridges; 3. Reticulate. The spores constitute an important source of characters with a systematic value for the genus Dennstaedtia and they are a useful tool for the identification of herbarium samples.
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Research Interests: Geography, Argentina, Protected areas, Buenos Aires, Ferns and Fern Allies, and 9 moreFlora and Vegetation, DIVERSIDAD, Ciencias Biológicas, Protected Areas, Buenos AIres, Helechos, Conservación De La Biodiversidad, Enseñanza - Aprendizaje Ciencias Naturales Y Exactas, and Revista de Biología Tropical
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Se realiza un análisis morfológico de la familia de helechos Lindsaeaceae en la Argentina, y se actualizan los datos de su distribución. A partir de la rectificación de información previa debida a citas no corroboradas y erróneas... more
Se realiza un análisis morfológico de la familia de helechos Lindsaeaceae en la Argentina, y se actualizan los datos de su distribución. A partir de la rectificación de información previa debida a citas no corroboradas y erróneas determinaciones se confirma la presencia de un único taxón en el país: Lindsaea quadrangularis subsp. terminalis. Se provee una descripción morfológica detallada, consideraciones sobre el hábitat, notas relevantes, ilustraciones, fotografías y un mapa de distribución de la especie en el área de estudio. Se elabora una clave para identificar las especies del género Lindsaea para la Argentina y áreas limítrofes de Brasil.
Research Interests:
A morphological analysis of the genus Dennstaedtia (Dennstaedtiaceae) from Argentina is carried out and distributional data updated. The studied species are: Dennstaedtia cicutaria, D. dissecta, D. glauca and D. globulifera. Until now,... more
A morphological analysis of the genus Dennstaedtia (Dennstaedtiaceae) from Argentina is carried out and distributional data updated. The studied species are: Dennstaedtia cicutaria, D. dissecta, D. glauca and D. globulifera. Until now, the information concerning the genus in Argentina was fragmented and incomplete. A comprehensive key to the species and detailed descriptions, distribution maps, habitat considerations, relevant notes, as well as photographs of diagnostic characters are provided for each taxon.
Research Interests:
Fil: Marquez, Gonzalo Javier. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Catedra de Morfologia Vegetal; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico... more
Fil: Marquez, Gonzalo Javier. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Catedra de Morfologia Vegetal; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - La Plata; Argentina