LICHALP

Thelidium fumidum (Nyl.) Hazsl.

Syn.: Verrucaria fumida Nyl.

Lichenised. Poorly known taxon.

Substrate: calciferous rocks

Altitudinal distribution: montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)

Note: a calcicolous species with a blackish brown, epilithic thallus, a blackish medullary layer, perithecia immersed in thalline warts, with involucrellum reaching down to the base, and 1-septate ascospores (mostly less than 25 µm long); rare throughout Eastern and Central Europe, with a few scattered records from the Alps.