Thelidium absconditum (Hepp) Rabenh.

Syn.: Sagedia nigella (Kremp.) Hepp var. abscondita Hepp, Thelidium rodellense Lettau
Lichenised.
Substrate: calciferous rocks, intermediate rocks (such as calciferous schists)
Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)
Note: on limestone, dolomite, calciferous schists in upland areas; probably more widespread in the Alps. The relationship with Th. decipiens remains to be clarified.
Austria: ?Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Germany: Oberbayern; Switzerland: Bern; Graubünden; Valais; France: Alpes-de-Haute-Provence; Haute-Alpes; Alpes-Maritimes; Drôme; Isère; Savoie; Haute-Savoie; Italy: Trentino Alto Adige; Slovenia: Alpine and Pre-Alpine Slovenia;