LICHALP

Verrucaria transfugiens Zschacke

Lichenised. Poorly known taxon.

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 with a thallus forming spreading, whitish-grey patches, entirely immersed ascomata (to 0.5 mm in diam.) without involucrellum, the perithecial wall dark brown throughout, and ellipsoid ascospores (to c. 25 µm long); in Europe here and there, with scattered records from the Alps, but perhaps not always distinguished.