A very variable species, characterized by terminal labriform soralia, when typically developed. It colonises a wide range of substrates: it occurs on calcareous and acidic substrates, natural and anthropogenic and is also quite common on trees. The lichen tolerates eutrophication and often occurs on nutrient rich stands. It is common in Europe as well as in the Czech Republic. In the field, it might be confused with certain forms of P. subalbinea, which has blue soralia and a different secondary metabolites content in the medulla.taxonomic classification:
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