Peltula obscurans (Nyl.) Gyeln.

Repert. Spec. Nov. Regni Veg., 38: 308, 1935. Basionym: Endocarpiscum obscurans Nyl. - Bull. Soc. Linn. Normandie, 2, 6: 309, 1872.
Synonyms: Acarospora collemacea Wedd.; Acarospora subglebosa (Müll. Arg.) Hue; Heppia acarosporoides Müll. Arg.; Heppia collemacea (Wedd.) Boistel; Heppia deserticola Zahlbr.; Peltula subglebosa (Müll. Arg.) Filson; Solorinaria collemacea (Wedd.) Gyeln.
Distribution: N - TAA, Lig. C - Tosc, Laz, Sar (Rizzi & al. 2011). S - Si (Nimis & al. 1996b).
Description: Thallus squamulose-umbilicate, heteromerous, the squamules entire to dissected, flat to convex, up to 2 mm wide, olive-brown to dark brown or almost black, when wet, dispersed or contiguous, sometimes overlapping; lower surface paler than the upper surface, attached by a more or less central, branched holdfast. Upper cortex not developed, but upper surface with a yellowish epinecral layer; medulla consisting of loosely interwoven hyphae and partly paraplectenchymatous; algal layer well-delimited, 90-180 µm thick; lower cortex hardly distinguishable from medulla. Apothecia 1-2 per squamule, at fist immersed, then adnate, 0.3-1 mm across, with an initially punctiform, later slightly expanded, reddish brown to brown disc, and a thin thalline margin. Proper exciple thin; epithecium yellowish brown, K+ red-violet or K-; hymenium colourless, I+ wine-red, 70-150 µm high. Asci >100-spored, clavate to obclavate, rostrate, the wall I+ orange, K/I+ blue. Ascospores 1-celled, hyaline, ovoid to ellipsoid, 4.5-7(-9) x 2-4 µm. Pycnidia immersed, cerebriform. Conidia ovoid-fusiform, 3.1-3.7 x c. 1.2 µm. Photobiont cyanobacterial, chroococcoid, one-celled. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on steeply inclined seepage tracks of basic siliceous rocks in lowland areas; a southern, mainly Mediterranean species in Europe, often found together with P. euploca, but much less frequent in Italy.
Growth form: Foliose, umbilicate
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: rare
Dry mediterranean belt: very rare

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 17546



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (10057)
2001/11/28



Pier Luigi Nimis - CC BY-SA 4.0
TSB 17546



Pier Luigi Nimis - CC BY-SA 4.0
TSB 17546


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltula_obscurans.htm
France, 19/10/2012 - col Santo Stefano, défilé de Lancone, alt. 333 m - sur roche - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltula_obscurans.htm
France, 19/10/2012 - col Santo Stefano, défilé de Lancone, alt. 333 m - sur roche - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltula_obscurans.htm
France, 19/10/2012 - col Santo Stefano, défilé de Lancone, alt. 333 m - sur roche - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltula_obscurans.htm
France, 19/10/2012 - col Santo Stefano, défilé de Lancone, alt. 333 m - sur roche - Corse


Manuel Gil
Spain, Canary Islands, Tenerife


Manuel Gil
Spain, Canary Islands, Tenerife


Manuel Gil
Spain, Canary Islands, Tenerife


Manuel Gil
Spain, Canary Islands, Tenerife


Manuel Gil
Spain, Canary Islands, Tenerife