LICHALP

Thelidium acrotellum Arnold

Lichenised. Poorly known taxon.

Substrate: calciferous rocks, siliceous rocks

Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) 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: on more or less calciferous rocks in upland areas; the species is not easy to distinguish from Th. minutulum, but has a colourless excipulum and a thin involucrellum; so far recorded from a few localities in the Alps.