LICHALP

Thelidium abstractum Lettau

Lichenised. Poorly known taxon.

Substrate: calciferous rocks

Altitudinal distribution: alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)

Note: a species of the Th. pyrenophorum-group with a thin, yellowish-grey, rimose epilithic thallus and smaller protruding ascomata (0.2-0.4 mm in diam.); on calcareous schists at high elevations; so far recorded from a few localities in the Alps.