''Circinaria caesiocinerea'' 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

Megasporaceae Megasporaceae are a family of fungi belonging to the order Pertusariales. Taxa are lichenized with green algae, and grow on rocks, often in maritime climates close to fresh water. Phylogenetic In biology, phylogenetics () is the study of the ...

. It was first described as ''Lecanora caesiocinerea'' in 1869 by

William Nylander William Andrew Michael Junior Nylander Altelius (born 1 May 1996) is a Swedish professional ice hockey Forward (ice hockey), forward for the Toronto Maple Leafs of the National Hockey League (NHL). Nylander was selected by the Maple Leafs in t ...

, but was transferred to the genus '' Circinaria'' in 2010 by Anders Nordin, Sanja Savić, and

Leif Tibell Leif Tibell (born 16 November 1944) is a Swedish lichenologist and Emeritus Professor at the University of Uppsala. He is known for his expertise on calicioid lichens. He was awarded the Acharius Medal in 2012 for lifetime achievements in lich ...

References

Megasporaceae Lichen species Taxa named by William Nylander (botanist) Lichens described in 1869 {{Pertusariales-stub