Protoparmeliopsis muralis (Schreb.) M. Choisy

A common saxicolous species, primarily colonizing calcareous substrates, such as limestone and various basic silicates, secondarily also on concrete, plaster, gravel stones, roof tiles, etc. It also occurs on pure silicates, typically at exposed nutrient-enriched places, such as protruding rocks or solitary boulders enriched with bird droppings. It may even grow on asphalt or other toxic anthropogenic substrates. The lichen occurs from lowlands to mountains, the most commonly at lower and middle elevations. It is a cosmopolitan species, mainly distributed in the temperate zone of the northern hemisphere, common in the Czech Republic. Conspicuously pruinose and pale specimens growing on limestone are sometimes considered a separate species P. versicolor, in the Czech Republic regarded as a variety (var. versicolor).

Ascomycota → Lecanoromycetes → Lecanorales → Lecanoraceae → Protoparmeliopsis