Lecanora orbicularis (Schaer.) Vain.

Lecanora orbicularis (Schaer.) Vain.

Syn.: Lecanora concolor Ramond var. angustata (Arnold) Jatta, Lecanora polytropa (Hoffm.) Rabenh. var. orbicularis Schaer.

Lichenised.

Substrate: siliceous rocks

Altitudinal range: from the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron) to the nival belt (above the lower limit of perennial snow and glaciers)

Note: an arctic-alpine lichen growing on hard siliceous rocks, often on steeply inclined to underhanging faces, with optimum above treeline; widespread in the siliceous Alps.

Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Switzerland: Bern; Graubünden; Valais; France: Alpes-de-Haute-Provence; Haute-Alpes; Alpes-Maritimes; Savoie; Italy: Trentino Alto Adige; Lombardia; Piemonte; Valle d'Aosta;

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