Gyalecta leucaspis (Kremp.) Kremp.

Syn.: Gyalecta acicularis Anzi, Secoliga leucaspis Kremp. ex A. Massal. nom.illeg., Thelotrema leucaspis Kremp.
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) 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 shaded, steeply inclined faces of dolomitic rocks, mostly below the alpine belt; certainly less common than G. jenensis, but widespread throughout the Alps.
Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Germany: Oberbayern; Switzerland: Graubünden; Vaud; France: Alpes-de-Haute-Provence; Alpes-Maritimes; Drôme; Isère; Haute-Savoie; Vaucluse; Var; Italy: Friuli; Veneto; Trentino Alto Adige; Lombardia; Piemonte; Slovenia: Trnovsky Gozd;