Tephromela atra is a variable lichen resembling Lecanora at first sight. It has conspicuous black apothecial discs and is easily distinguished by violet hymenium, which is evident as a dark layer in damaged apothecia even in the field.
It has an exceptionally wide ecological amplitude. Various ecotypes are regarded as varieties (e. g., Nimis et al. 2018). It mainly grows on siliceous rocks but also on calcareous substrates, tree bark or wood. It has cosmopolitan distribution, from lowlands to mountains. Very common in Europe, scattered all over the Czech Republic, recently only on rocks.
Literature: Nimis P. L., Hafellner J., Roux C., Clerc P., Mayrhofer H., Martellos S. & Bilovitz P. O. (2018): The lichens of the Alps – an annotated checklist. – Mycokeys 31: 1–634.taxonomic classification:
All records: 90, confirmed 71. One click on a selected square displays particular record(s), including their source(s).