Polyblastia nidulans (Stenh.) Arnold
Syn.: Verrucaria nidulans Stenh.
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the nival belt (above the lower limit of perennial snow and glaciers)
Note: on compact limestone and dolomite in sheltered situations, with optimum above treeline.
Austria: ?Vorarlberg; Tirol; Salzburg; Steiermark; France: Alpes-de-Haute-Provence; Alpes-Maritimes; Drôme; Isère; Savoie; Haute-Savoie; Vaucluse;
