Verrucaria mortarii (Arnold) Arnold ex Lamy nom.illeg. non Leight.

Syn.: Amphoridium leightonii Arnold f. mortarii Arnold, Amphoridium mortarii (Arnold) Flagey
Lichenised. Poorly known taxon.
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: a species growing on man-made calciferous substrata, including mortar, especially on walls below the montane belt, closely related to V. foveolata; apparently most frequent in the Southern and Western Alps. The name is illegitimate.
France: Haute-Alpes; Alpes-Maritimes; Isère; Savoie; Vaucluse; Var; Italy: Piemonte;