Altitudinal range: from the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron) 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 species resembling P. incrustans, but with a distinctly epilithic, whitish to brownish thallus and somewhat larger apothecia (to 1 mm in diam.); on shaded calcareous rocks, so far only known from the Eastern Alps (Austria).
