Staurothele immersa (Bagl. ex A. Massal.) Dalla Torre & Sarnth.

Syn.: Porphyriospora immersa Bagl. ex A. Massal.; incl. Staurothele isarina Riehm.
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)
Note: on limestone and dolomite, usually on steeply inclined surfaces; this is one of the few species of the genus with optimum below the montane belt; apparently most frequent in the Western and Southern Alps.
France: Alpes-de-Haute-Provence; Haute-Alpes; Alpes-Maritimes; Drôme; Isère; Haute-Savoie; Vaucluse; Var; Italy: Trentino Alto Adige;