Verrucaria euganea Trevis.

Syn.: Verrucaria weddellii auct. non Servít
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)
Note: an early coloniser of walls (mortar, brick, cement, limestone) in urban settlements; related to V. macrostoma, but differing in several important morphological characters; apparently most frequent in the Southern and Western Alps, but probably more widespread.
Austria: Niederösterreich (incl. Wien); France: Alpes-de-Haute-Provence; Alpes-Maritimes; Drôme; Isère; Vaucluse; Var; Italy: Veneto; Trentino Alto Adige; Piemonte; Liguria;