Verrucaria caerulea DC.

Syn.: Involucrothele bormiensis (Servít) Servít, Involucrothele plumbea (Ach.) Servít, Thelidium plumbeum (Ach.) Servít, Thelidium plumbeum (Ach.) Servít f. orbiculare Kremp. ex Servít, Verrucaria bormiensis Servít, Verrucaria glaucina Ach. non auct., Verrucaria plumbea Ach., Verrucaria truncatula Nyl.
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the nival belt (above the lower limit of perennial snow and glaciers)
Note: on steeply inclined surfaces of compact calciferous rocks; widespread throughout the Alps. Probably related to Staurothele.
Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Burgenland; Switzerland: Bern; Graubünden; Luzern; Schwyz; Vaud; France: Alpes-de-Haute-Provence; Alpes-Maritimes; Drôme; Isère; Savoie; Haute-Savoie; Var; Italy: Friuli; Veneto; Trentino Alto Adige; Lombardia; Piemonte; Liguria; Slovenia: Alpine and Pre-Alpine Slovenia; Trnovsky Gozd;