The species can be identified in the field thanks to the thick, relatively well-delimited thallus and a specific ecology. It grows in humid and shaded habitats, especially on siliceous and calcareous rock overhangs. Often, it passes onto bryophytes. The lichen is widespread in Europe. In the Czech Republic, it occurs sparsely, but in suitable habitats, it may become a locally dominant species. Lepraria crassissima is relatively abundant at lower elevations in areas with sandstone rocks in northern Bohemia, otherwhere it prefers middle and higher elevations.taxonomic classification:
All records: 80, confirmed 74. One click on a selected square displays particular record(s), including their source(s).