LICHALP

Thelocarpon impressellum Nyl.

Syn.: Ahlesia impressella (Nyl.) G. Salisb.

Lichenised.

Substrate: acidic soil (mostly on siliceous substrata), calciferous soil, calciferous rocks, siliceous 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 doubtfully lichenised species found on humus-rich soil, mosses, rotten wood and other lichens in upland areas. The only Italian record, growing on Squamarina cartilaginea, is dubious.