Gyalolechia pruinosa Körb. var. pruinosa

Syn.: Caloplaca pruinosa (Körb.) Zahlbr., Fulgensia pruinosa (Körb.) Poelt
Lichenised.
Substrate: calciferous rocks, calciferous soil
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: on steeply inclined to underhanging faces of calcareous rocks, mostly in fissures, sometimes on epilithic bryophytes, with optimum above treeline.
Austria: Vorarlberg; Tirol; Kärnten; Steiermark; Oberösterreich; Germany: Oberbayern; Schwaben; Switzerland: Graubünden; Schwyz; France: Alpes-de-Haute-Provence; Haute-Alpes; Italy: Trentino Alto Adige; Lombardia; Slovenia: Alpine and Pre-Alpine Slovenia;