Altitudinal distribution: subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a species close to or perhaps identical with P. fuscoargillacea, with a thin, whitish, rimose thallus and small ascomata with a basally pale wall and a descending involucrellum, broadly ellipsoid ascospores with 5-7 transversal septa and 2-3 longitudinal septa; the type is on phyllitic rock, but the species was also found on calcareous schists; rather common in the Alps at high elevations, but often confused with other species.
