Circinaria calcarea (L.) A. Nordin, Savić & Tibell

A calciphilous lichen. Besides limestones, it may grow on other, predominantly calcareous rocks. Most often, it occurs on natural, well-lit rocky outcrops at lower and middle elevations. In Europe, it is a common lichen, especially in the Mediterranean. In the Czech Republic, it appears rather locally, especially in karst areas with the presence of pure limestones.

Ascomycota → Lecanoromycetes → Pertusariales → Megasporaceae → Circinaria