LICHALP

Thelidium verrucosum Zschacke

Lichenised.

Substrate: calciferous rocks

Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)

Note: a calcicolous species of the Th. papulare-group with an endolithic thallus, ascomata immersed in up to 1 mm broad, concolorous warts, a spreading involucrellum, and 3-septate ascospores (to c. 35 µm long); rare throughout Central Europe, including the Eastern Alps (Austria).