The rarest Protothelenella species in the Czech Republic. It is an arctic-alpine lichen, growing on bryophytes or humus on acidic substrates in open habitats. It is the least gelatinous of the Czech Protothelenella species when wet. The thallus is composed of pale grey warty areoles. Perithecia are pale and entirely immersed, only the ostiole, which is slightly more pigmented than the thallus, is visible. The pale perithecia of a similar genus Thelenella are not usually entirely immersed and are easily recognizable microscopically. Additionally, there are ecological differences (see Thelenella muscorum, T. modesta and T. pertusariella).
There is a single historical record of * P. leucothelia* from the Czech Republic – from the top parts of the Sněžka Mt by G. Koerber (Stein 1879), later referred to in other publications too (see the Catalogue by Vězda & Liška 1999). Outside of Fennoscandia, it occurs in the highest European mountains, i.e., the Alps and the Carpathians.
Literature: Stein B. (1879): Flechten. – In: Cohn F. [ed.], Kryptogamen-Flora von Schlesien, 2(2): 1–400, J. U. Kern’s Verlag, Breslau.
taxonomic classification:Ascomycota → Lecanoromycetes → Ostropales → Protothelenellaceae → Protothelenella
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