Thelotrema lepadinum (Ach.) Ach.

Syn.: Lichen lepadinus Ach., Volvaria lepadina (Ach.) A. Massal.
Lichenised.
Substrate: bark
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)
Note: a mild-temperate lichen found on the bark of Fagus and Abies, more rarely of other broad-leaved trees in humid montane forests with frequent fog or near rivers; widespread throughout the Alps, but generally not common, and perhaps declining.
Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Germany: Oberbayern; Switzerland: Bern; Fribourg; Glarus; Graubünden; Luzern; St. Gallen; Schwyz; Uri; Unterwalden; Vaud; Valais; France: Alpes-Maritimes; Italy: Friuli; Veneto; Trentino Alto Adige; Lombardia; Piemonte; Slovenia: Alpine and Pre-Alpine Slovenia; Trnovsky Gozd;