Rock greenshield lichen

Flavoparmelia baltimorensis

''Flavoparmelia baltimorensis'' or Rock greenshield lichen is a medium to large foliose lichen with a yellow green upper surface when dry; lobes rounded without pseudocyphellae; the upper surface with globose, pustule-like growths resembling isidia. Lower surface is black with a narrow brown zone at the margins.
Rock Greenshield Lichen (Flavoparmelia baltimorensis) This lichen is very similar to F. caperata but grows on rocks as the common name suggests. Canada,Flavoparmelia baltimorensis,Geotagged,Rock greenshield lichen,Summer

Naming

The very similar, ''Flavoparmelia caperata'', usually grows on the bark of trees, but may be found on rock. The granular soredia produced in irregular soralia distinguishes it from ''F. baltimorensis'' which lacks true soredia.

''Flavopunctelia flaventior'' and ''Flavopunctelia soredica'' have pseudocyphellae in the upper surface of the thallus, and the medulla is C+ red.

Habitat

On rock in shaded or exposed areas.

References:

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Taxonomy
KingdomFungi
DivisionAscomycota
ClassLecanoromycetes
OrderLecanorales
FamilyParmeliaceae
GenusFlavoparmelia
SpeciesF. baltimorensis
Photographed in
Canada