Buellia saxorum A. Massal.

Syn.: Buellia superans (Nyl.) Mong., Lecidea saxorum (A. Massal.) Hepp, Lecidea superans Nyl.
Lichenised.
Substrate: siliceous rocks
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)
Note: on steeply inclined surfaces of siliceous rocks, mostly not far from the coast.
France: Vaucluse; Italy: Veneto; Liguria;