''Varicellaria hemisphaerica'' is a species of

crustose lichen Crustose lichens are lichens that form a crust which strongly adheres to the Substrate (biology), substrate (soil, rock, tree bark, etc.), making separation from the substrate impossible without destruction. The basic structure of crustose lichen ...

belonging to the family

Varicellariaceae ''Varicellaria'' is a genus of crustose lichens. It is the only genus in the family Varicellariaceae. Taxonomy The genus ''Varicellaria'' was circumscribed by Finnish lichenologist William Nylander in 1858, with '' Varicellaria microsticta'' ass ...

. It has an almost

cosmopolitan distribution In biogeography, cosmopolitan distribution is the term for the range of a taxon that extends across all or most of the world in appropriate habitats. Such a taxon, usually a species, is said to exhibit cosmopolitanism or cosmopolitism. The ext ...

References

Pertusariales Lichen species Lichens of Europe Lichens described in 1815 Taxa named by Heinrich Gustav Flörke {{Pertusariales-stub