A well-recognizable species within the genus, with patchy, finely structured, loosely attached radial thallus. It consists of narrow, almost cylindrical, only little flattened lobes, which may be covered with adventive lobes resembling isidia when older. It grows on pure limestone and dolomite on relic rock stands. The only Czech record came from the Kotouč Hill near Štramberk which is already mined off (Suza 1928, as Pterygium centrifugum) and represented a western outpost in its Carpathian distribution. A reference to the Petrovy kameny in the catalogue by Vězda & Liška (1999) was a mistake. Thus, it is considered a missing or regionally extinct species. It is still quite common in limestone areas of the Carpathians in Slovakia.
Literature: Suza J. (1928): Zajímavé nálezy lišejníků v Československu. – Časopis Moravského zemského musea 25: 283–287. Czeika H. & Czeika G. (2007): Placynthium in den Alpen und Karpaten sowie in benachbarten Gebieten. – Herzogia 20: 29–51.taxonomic classification:
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