Calicium parvum Tibell

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. Single records are known from several other localities in Bohemia.

Literature: Peksa O. (2006): Calicium parvum (Caliciaceae) – a new calicioid lichen to the Czech Republic. – Silva Gabreta 12: 51–56.

Ascomycota → Lecanoromycetes → Caliciales → Caliciaceae → Calicium