A relatively rare calciphilous species characterised by a more or less immersed white to light grey thallus and reddish-brown to black, reddish-brown when wet, epruinose apothecia with a black margin in shallow pits.
This species mainly occurs on smaller calcareous stones (including the calcareous sandstone “opoka”) or even gravel as a pioneer lichen of open habitats, such as dry grasslands, from lowlands to mountains. In Europe, C. metzleri is distributed from the Mediterranean to the temperate zone. In the Czech Republic, there is a single historical record from the Podyjí region and a couple of recent findings (Bohemian karst, Bílé Stráně near Litoměřice).
taxonomic classification:Ascomycota → Lecanoromycetes → Lecanorales → Lecideaceae → Clauzadea
All records: 4, confirmed 3. One click on a selected square displays particular record(s), including their source(s).