Pseudosagedia byssophila (Körb. ex Hepp) Hafellner & Kalb

Syn.: Porina byssophila (Körb. ex Hepp) Zahlbr., Sagedia byssophila Körb. ex Hepp, Spermatodium cinereorufescens Trevis.
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) 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: a mild-temperate to humid subtropical species of calcareous rocks in damp and shaded habitats, e.g. in forests; somehow rarer than the closely related P. linearis. The species might belong to Trichothelium.
Austria: Tirol; Kärnten; Steiermark; Niederösterreich (incl. Wien); Switzerland: Graubünden; Luzern; Schwyz; France: Alpes-de-Haute-Provence; Alpes-Maritimes; Isère; Haute-Savoie; Vaucluse; Var; Italy: Trentino Alto Adige; Slovenia: Trnovsky Gozd;