Little known species from the R. obscuratum group with small apothecia and small submuriform spores. Within the group it is also distinguished by the presence of gyrophoric acid in the thallus and a K+ purple pigment in the exciple (Ihlen 2004). A similar R. postumum is distinguished by the presence of stictic acid in the thallus (C- and K+ yellow), different pigments and flat apothecia (they are concave with a higher margin in R. subpostumum).
The species has a suboceanic distribution area and grows on siliceous rocks. Because it is small and easily misidentified, there is almost no information about it in the Czech Republic. It was collected only at a single locality in the Žďárské vrchy highlands by F. Kovář (1907). But the specimen has not been revised and the locality re-visited ever since.
Literature: Kovář F. (1907): Příspěvek ku květeně lišejníků moravských. – Věstník Klubu přírodovědců v Prostějově 9: 37–48. Ihlen P.G. (2004): Taxonomy of the non-yellow species of Rhizocarpon (Rhizocarpaceae, lichenized Ascomycota) in the Nordic countries, with hyaline and muriform ascospores. – Mycological Research 108: 533–570.
taxonomic classification:Ascomycota → Lecanoromycetes → Rhizocarpales → Rhizocarpaceae → Rhizocarpon
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