Umbilicaria ruebeliana (Du Rietz & Frey) Frey

Syn.: Gyrophora ruebeliana Du Rietz & Frey, Omphalodiscus ruebelianus (Du Rietz & Frey) Schol.
Lichenised.
Substrate: siliceous 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 steeply inclined to underhanging, often south- or west-facing surfaces of siliceous rocks above treeline.
Austria: Tirol; Salzburg; Switzerland: Bern; Graubünden; Ticino; Valais; France: Alpes-de-Haute-Provence; Haute-Alpes; Alpes-Maritimes; Italy: Trentino Alto Adige; Lombardia; Piemonte; Valle d'Aosta;