Psorotichia fuliginascens (Nyl.) Forssell

Syn.: Collemopsis fuliginascens Nyl., Porocyphus fuliginascens (Nyl.) Couderc, Pyrenopsis lignyota auct. non (Wahlenb.) Th. Fr.
Lichenised. Poorly known taxon.
Substrate: siliceous rocks
Altitudinal distribution: subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a species perhaps related to Thelignya lignyota but with a black thallus of aggregated squamules which are less than 1 mm wide, and with innate, minute apothecia; the generic placement is in need of re-evaluation; based on a type from Finland where it was found on mica-schist, ecology and overall distribution poorly documented, with a record from the Western Alps (France).
France: Haute-Savoie;