Psoroma hypnorum (Vahl) Gray

Nat. Arrang. Brit. Plants, 1: 445, 1821. Basionym: Lichen hypnorum Vahl - Fl. Dan., 6, 16: 8, 1787.
Synonyms: Lecanora hypnorum (Vahl) Ach.; Pannaria femsjonensis var. microphylla Anzi nom. nud.; Pannaria hypnorum (Vahl) Körb.; Pannaria porriginosa Vain.; Parmelia lepidora Ach.; Psora deaurata Hoffm.
Distribution: N - Frl (Tretiach & Hafellner 2000), Ven (Nascimbene & Caniglia 1997, Caniglia & al. 1999), TAA (Bilovitz & al. 2014, Nascimbene & al. 2022), Lomb, Piem (Isocrono & al. 2003, 2004), VA (Piervittori & Isocrono 1999, Piervittori & al. 2004, Isocrono & al. 2008), Emil (Fariselli & al. 2020). C - Tosc (Benesperi & al. 2007), Marc, Umb (Ravera & al. 2006), Laz, Abr (S-F156497), Sar. S - Camp, Bas (CLU 3356), Cal (Puntillo 1996).
Description: Thallus crustose to subsquamulose, green-grey to yellowish brown in sun-forms, bright green when wet, thick, areolate-lobulate. Areoles subgranular to mostly subsquamulose, contiguous to imbricate, 0.2-0.5 mm wide, with interspersed, darker, blue-grey to brown, more granular squamules containing Nostoc (cephalodia). Upper and lower cortex paraplectenchymatous, 30-40 µm thick. Apothecia lecanorine, sessile, up to 5 mm across, with a brown, concave, smooth disc, and a persistent, 100-200 µm thick, verruculose thalline margin with numerous squamules and thin transparent hairs in the lower part. Epithecium brownish; hymenium colourless, 100-130 µm high, I+ dark blue; paraphyses simple, up to 4.5 µm thick, the apical cells not swollen; hypothecium colourless. Asci 8-spored, narrowly ellipsoid or cylindrical, the apex with a K/I+ deep blue central tube in a paler-staining tholus, and an internal, K/I+ dark blue ring-structure. Ascospores 1-celled, hyaline, ellipsoid, thick-walled, (19-)22-34 x 8-12 µm including the warted-ridged epispore, apiculate at one or both ends. Pycnidia rare, pale brown, globose, semi-immersed. Conidia bacilliform, 5-6 µm long. Photobiont chlorococcoid in thallus, cyanobacterial (Nostoc) in cephalodia. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: an arctic-alpine to boreal-montane, circumpolar lichen found on soil, often in and amongst bryophytes over siliceous substrata, in moist habitats near or above treeline; most frequent in the Alps, where it can reach the nival belt, much rarer along the Apennines.
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: rather common
Subalpine belt: rather rare
Oromediterranean belt: extremely rare
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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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

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (5052)
2001/11/29


Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019



Pier Luigi Nimis CC BY-SA 4.0
TSB 41674



Pier Luigi Nimis CC BY-SA 4.0
TSB 41674


Zahlbruckner A. 1926. Lichenes (Flechten). In: Engler A. (ed.): Die natürlichen Pflanzenfamilien. 2nd ed., vol 8, W. Engelmann, Leipzig, 270 pp.



P.L. Nimis CC BY-SA 4.0
TSB 44136



Pier Luigi Nimis - CC BY-SA 4.0
TSB 43944



Pier Luigi Nimis - CC BY-SA 4.0
TSB 43944


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Psoroma_hypnorum.htm
France, 23/9/2019 - Col du Petit Mont Cenis, alt. 2200 m - Savoie