A black-gray, filamentous cyanolichen, whose symbiotic partner is a cyanobacteria from the genus Stigonema. Its typical habitat are places with running water on moist siliceous rocks or irrigated boulders in the splash zone of watercourses. In Central Europe, it belongs to relatively abundant mountain lichens, for example, in the higher altitudes of the Alps and the Carpathians. The species is very rare in the Czech Republic, known only from the locality Jezerní stěna in the Šumava Mountains and from glacial cirques in the Krkonoše Mountains, where it may be locally common.
Literature: Černohorský Z., Nádvorník J. & Servít M. (1956): Klíč k určování lišejníků ČSR. I. díl. – Nakladatelství ČSAV, Praha.taxonomic classification:
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