lichen
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Parmeliaceae. The genus was
circumscribed
In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius.
Not every polyg ...
by American lichenologist
Mason Hale
Mason Ellsworth Hale, Jr. (September 23, 1929 – April 23, 1990) was one of the most prolific lichenologists of the 20th century. Many of his scholarly articles focused on the taxonomy of the family Parmeliaceae. Hale was one of the first liche ...
Xanthoparmelia
''Xanthoparmelia'' (commonly known as green rock shields or rock-shield lichens) is a genus of foliose lichen in the family Parmeliaceae.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ''Xanthoparmelia'' is syn ...
'') as the type species. Hale included five species in his original conception of the genus; the Siberian species '' A. collatolica'' was added in 2019.
Species
*''
Arctoparmelia aleuritica
''Arctoparmelia'' is a genus of ring lichens in the family Parmeliaceae. The genus was circumscription (taxonomy), circumscribed by American lichenologist Mason Hale in 1986 with ''Arctoparmelia centrifuga, A. centrifuga'' (formerly in ''Xa ...
'' (Nyl.) Hale (1986)
*'' Arctoparmelia centrifuga'' (concentric ring lichen) (L.) Hale (1986)
*''
Arctoparmelia collatolica
''Arctoparmelia'' is a genus of ring lichens in the family Parmeliaceae. The genus was circumscribed by American lichenologist Mason Hale in 1986 with '' A. centrifuga'' (formerly in ''Xanthoparmelia'') as the type species. Hale included ...
'' Chesnokov & Prokopiev (2019)
*''
Arctoparmelia incurva
''Arctoparmelia'' is a genus of ring lichens in the family Parmeliaceae. The genus was circumscribed by American lichenologist Mason Hale in 1986 with '' A. centrifuga'' (formerly in ''Xanthoparmelia'') as the type species. Hale included ...