A subtle Calicium species, differing from similar species by containing diffractic acid in the pustulate thallus and by clavate asci with biseriate spores. It is an epiphytic lichen specialised to pine bark (Czech findings are mainly from Pinus sylvestris). However, infrequently it is found also on spruces or fir trees. The species prefers open, humid habitats, such as screes or peatbogs, but may occur even in well-lit managed forests. It grows in boreal habitats of the Northern Hemisphere. From the Czech Republic, it was reported only from the Třeboň region (where it is relatively common), lower parts of the Šumava Mts and the Novohradské hory Mts. Recently, it has been found also in the Křivoklát region, in the protected area of Týřov.
Literature: Peksa O. (2006): Calicium parvum (Caliciaceae) – a new calicioid lichen to the Czech Republic. – Silva Gabreta 12: 51–56.
taxonomic classification:Ascomycota → Lecanoromycetes → Caliciales → Caliciaceae → Calicium
Red List (Liška & Palice 2010):EN – endangered
Red List (Malíček 2023):C3 – endangered
Occurrence in the Czech Republic
All records: 35, confirmed 35. One click on a selected square displays particular record(s), including their source(s).