Common greenshield lichen

Flavoparmelia caperata

''Flavoparmelia caperata'' or common greenshield lichen is a medium to large foliose lichen that has a very distinctive pale yellow green upper cortex when dry. The rounded lobes, measuring 3–8 mm wide, usually have patches of granular soredia arising from pustules. The lobes of the thallus may be smooth, but quite often have a wrinkled appearance especially in older specimens. The lower surface is black except for a brown margin; rhizomes attached to the lower surface are black and unbranched.
Flavoparmelia caperata Flavoparmelia caperata on a small lower branch of Bigtooth Aspen (Populus grandidentata). Common greenshield lichen,Flavoparmelia caperata,Geotagged,Populus grandidentata,Spring,United States,bigtooth aspen,green lichen,lichen

Naming

The very similar ''Flavoparmelia baltimorensis'' grows mainly on rock and has globose, pustular outgrowths on the upper surface of the lobes, but does not produce granular soredia.
cabbage looking normally called common greenshield lichen Flavoparmelia caperata,Geotagged,United Kingdom

Habitat

On bark of trees, but occasionally on rock.

References:

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Status: Unknown
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Taxonomy
KingdomFungi
DivisionAscomycota
ClassLecanoromycetes
OrderLecanorales
FamilyParmeliaceae
GenusFlavoparmelia
Species