Rhizocarpon furfurosum H. Magn. & Poelt

Lichenised.
Substrate: metal-rich siliceous rocks, siliceous rocks
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: on metal-rich siliceous rocks, mostly on steeply inclined to underhanging faces in upland areas; easy to overlook, being mostly sterile, and to be looked for further in the Alps.
Austria: Salzburg; Steiermark; France: Alpes-Maritimes; Italy: Piemonte;