Thelidium circumspersellum (Nyl.) Zschacke
Syn.: Verrucaria circumspersella Nyl.
Lichenised. Poorly known taxon.
Substrate:
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)
Note: a calcicolous, aquatic species; hitherto only known from the type locality in Hungary and a single locality in Upper Austria.
Austria: Oberösterreich;