LICHALP

Porpidia crustulata (Ach.) Hertel & Knoph

Syn.: Biatora crustulata (Ach.) Hepp, Haplocarpon crustulatum (Ach.) M. Choisy, Huilia crustulata (Ach.) Hertel, Lecidea chrysoteichiza Nyl., Lecidea crustulata (Ach.) Spreng., Lecidea martinatiana A. Massal., Lecidea parasema (Ach.) Ach. var. crustulata Ach., Lecidea scutellata Walt. Watson, Lecidea umensis H. Magn.

Lichenised.

Substrate: siliceous rocks, lignum

Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) 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 widespread, holarctic early coloniser of siliceous pebbles and small stones on the ground, with a wide altitudinal range; common throughout the Alps.