A small, crustose lichen with grey sorediate thallus. It belongs to the genus Pyrenodesmia, which comprises species not producing yellow-orange pigments (anthraquinones). In the Czech Republic, this lichen occurs usually sterile (without fruiting bodies) and can be easily mistaken for species with similar thallus, especially for C. soralifera. It is a pioneer species known from the continental regions of Eurasia and the Mediterranean. It prefers early succession stages on anthropogenic and natural calcareous substrates (concrete, limestone rocks). In the Czech Republic, it is known only from Černá rokle in the Bohemian Karst (Český kras) and from Prokopské údolí in Prague.taxonomic classification: most frequented synonyms:Pyrenodesmia concreticola
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