A species similar to P. hirsuta, distinguished by the presence of isidia or lobules which are often ciliate. It may grow on calcareous rocks, mosses or on nutrient-rich tree bark. Generally, it is a rare species, in central Europe only known from the Alps, the Carpathians and the Hrubý Jeseník Mts. The only Czech record is from calcareous phyllites at the Petrovy kameny Mt, however, it has not been confirmed there recently.taxonomic classification:
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