A very variable species. It has a grey to grey-green thallus and apothecia of a colour from beige to black. It is ecologically linked to various substrates over a calcareous base – typically to bryophytes, soil or rocks. It occurs both on natural outcrops and in anthropogenic habitats (concrete, walls, etc.). Less often it may be found on mossy trunks of deciduous trees with higher bark pH. It belongs to common species in Europe. In the Czech Republic, it is common locally, in the areas rich in calcareous rocks from lowlands to mountains. Besides, it sparsely occurs on anthropogenic substrates.taxonomic classification:
All records: 286, confirmed 151. One click on a selected square displays particular record(s), including their source(s).