Calicium glaucellum Ach.

This lichen has a more or less immersed thallus and lower, black, stalked apothecia with a white pruina on their margins. Its most common substrate are snags of any tree species. Besides, it grows also on acidic bark (mainly of conifers). It occurs in several types of natural old forests and also in relic open habitats (such as screes and rocks). It is primarily a boreal-montane element, relatively common in Czech mountains and mountain foothills. Sometimes it passes also to lower elevations. Surprisingly, there are no historical reports from the country (see the catalogue by Vězda & Liška 1999). Based on the description in the identification key by J. Nádvorník (Nádvorník 1940) we assume C. glaucellum used to be incorrectly classified as* C. abietinum* in the past.

Literature: Nádvorník J. (1940): Systematische Übersicht der mitteleuropäischen Arten der Flechtenfamilie Caliciaceae. – Preslia 18–19: 113–129.

Ascomycota → Lecanoromycetes → Caliciales → Caliciaceae → Calicium