Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a species resembling P. formosum in the grey, areolate, non-lobate thallus, but ascospores with a thin perispore; lichenicolous on thalli of Aspicilia calcitrapa on basic to subneutral siliceous rocks in dry-warm sites; recently described from the Pyrenees and so far only known from the western Mediterranean region, with records from the base of the Western Alps (France).
