LICHALP

Porpidia speirea (Ach.) Kremp. var. prochsthallina (A. Massal.) Clauzade & Cl. Roux ex Hafellner & Türk

Syn.: Lecidea elata Schaer. var. prochsthallina A. Massal., Lecidea speirea (Ach.) Ach. var prochsthallina (A. Massal.) Hertel

Lichenised.

Substrate: siliceous rocks, intermediate rocks (such as calciferous schists)

Altitudinal range: from the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron) 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 taxon differing from var. speirea in having a pale yellow thallus; on calcareous schists, widespread in the Holarctic region but rare throughout the Alps.