Placidium boccanum (Servít) Breuss

Syn.: Catapyrenium boccanum (Servít) Breuss, Dermatocarpon boccanum Servít
Lichenised.
Substrate: calciferous soil, 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: a Mediterranean to mild-temperate lichen growing on calciferous clayey soil, often also found on walls, including those of mortar; very rare in the Alps.
France: Alpes-Maritimes; Italy: Veneto;