ITALIC 7.0

Placidiopsis custnani (A. Massal.) Körb.

Parerga Lichenol.: 305, 1863. Basionym: Placidium custnani A. Massal. - Lotus, 6: 78, 1856.

Synonyms: Catapyrenium custnani (A. Massal.) Jatta; Dermatocarpon crenulatum (Nyl.) Mig.; Endocarpidium custnani (A. Massal.) Müll. Arg.; Endocarpon cinereum var. cartilagineum Nyl.; Paraplacidiopsis crenulata (Nyl.) Servít; Placidiopsis cartilaginea (Nyl.) Vain.; Placidiopsis crenulata (Nyl.) Zschacke; Verrucaria crenulata (Nyl.) Nyl.

Distribution: N - Ven (Lazzarin 2000b, Breuss 1996b), TAA (Nascimbene & al. 2022), Lomb, Piem, VA (Piervittori & Isocrono 1999). S - Si (Breuss 1996b).

Description: Thallus squamulose, the squamules crenate-lobulate, scattered to usually contiguous, pale olive brown to brown, olive-green when wet, up to 2(-3) mm wide; lower surface dark brown to black, paler towards margins, 0.2-0.4 mm thick. Upper cortex very thin, paraplectenchymatous, composed of 1-2 layers of globose cells, overlain by an up to 30 µm thick epinecral layer; medulla white, of thin-walled, globose cells; lower cortex not developed. Rhizohyphae brown, in the central part usually aggregated into a rhizine-like holdfast. Perithecia black, pyriform to globose, 1-5 per squamule, 0.2-0.23 mm across, immersed, without involucrellum. Exciple blackish brown in upper part, pale below, of tangentially arranged cells; paraphyses absent, but periphyses present around the ostiole. Asci 8-spored, clavate, thin-walled, the apical region slightly thickened, with a small ocular chamber, K/I-. Ascospores 1-septate, hyaline, ellipsoid to fusiform, (12-)14-20(-22) x 5.5-7.5 μm, thin- and smooth-walled, biseriately arranged in the asci. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: an overlooked terricolous lichen found on calciferous soil and calcicolous mosses which, in Italy, seems to be most common in the submediterranean belt. Most of the records are from the Alps.

Growth form: Crustose

Substrata: soil, terricolous mosses, and plant debris

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: rare

Padanian area: absent

Humid submediterranean belt: very rare

Humid mediterranean belt: very rare

Dry mediterranean belt: rare

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

GZU - Vezda Lich.Sel.Exs. (951)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: GZU - Vezda Lich.Sel.Exs. (951)
2003/04/28

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: GZU - Vezda Lich.Sel.Exs. (951)
2003/04/28

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Placidiopsis_custnani.htm

France, 8/7/2011 - Miribel Jonaje - Rhöne

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Placidiopsis_custnani.htm

France, 8/7/2011 - Miribel Jonaje - Rhöne

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Placidiopsis_custnani.htm

France, 8/7/2011 - Miribel Jonaje - Rhöne

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Placidiopsis_custnani.htm

France, 8/7/2011 - Miribel Jonaje - Rhöne