Psoroma hypnorum (Vahl) Gray

A lichen with granulose to squamulose thallus, containing algae of the genus Coccomyxa and usually also cephalodia. Apothecia are conspicuous, with red-brown discs and lacerate to squamulose margins. From the similar * P. femsjonense*, it can be distinguished by a pale brown coloured thallus, frequent presence of squamules on apothecium margins, larger warts on the perispore and the absence of secondary metabolites (detected by TLC).

Psoroma hypnorum grows mainly on bryophytes, acidic soil and plant debris in humid stands. In oceanic areas, it is also epiphytic. It is an arctic-alpine to boreal-montane species, in central Europe only known from humid mountain areas. There are numerous historical records from the area of the Czech Republic (see the Vězda & Liška 1999 catalogue), including the highest elevations of the Krkonoše Mts. However, it has recently only been found at the limestone locality Tvarožné díry in the Králický Sněžník Mts.

Literature: Jørgensen P.M. (2007): Pannariaceae. – Nordic Lichen Flora 3: 96–112. Elvebakk A. (2012): An overlooked Psoroma in Denmark and southern parts of Sweden. – Graphis Scripta 24: 45–48. Elvebakk A. (2022): Psoroma femsjonense (Fr.) Trevis., a misunderstood species possibly extinct from Europe. – Graphis Scripta 34: 22–35.

taxonomic classification:

Ascomycota Lecanoromycetes Peltigerales Pannariaceae Psoroma

Red List (Liška & Palice 2010):CR – critically endangered
Red List (Malíček 2023):C1 – critically endangered

Occurrence in the Czech Republic

All records: 5, confirmed 4. One click on a selected square displays particular record(s), including their source(s).


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Altitude preferences

Distribution Timeline

Substrate type

Substrate preferences

© Botanický ústav AV ČR, v. v. i. 2020–2024