Flavoparmelia caperata (L.) Hale
Parmelia caperata (L.) Ach.
Parmelia cylisphora (Ach.) Vain.
Parmelia flavicans (Tuck.) Tuck.
Parmelia herreana Zahlbr.
Parmelia negativa Gyel.
Pseudoparmelia caperata (L.) Hale
Common greenshield, flavoparmelia lichen
Here in Massachusetts, I see more of these lichens than any others. I haven’t found a range map yet, but as nearly as I can tell, they occur worldwide.
Identification: This widespread lichen grows in circular patches on \[tree bark], and sometimes on rock. It is a pale yellow green color on top, and black below (pale brown on the edges). It is foliose (leaflike), with rounded, overlapping lobes. The apothecia (fruiting bodies) are goblet-shaped, and up to about ¼" (6.3 mm) in diameter, but they are not present very often.
Flavoparmelia caperata at the Island Creek Elementary School's Study of Northern Virginia Ecology
Flavoparmelia caperata on Discover Life
Flavoparmelia caperata on CalPhotos
Flavoparmelia caperata on Macrolichens of North America
Flavoparmelia caperata on the Stridvall Family Domain
Flavoparmelia caperata on the Mushroom Observer
Flavoparmelia caperata on Wikispecies
Flavoparmelia caperata at the Consortium of North American Lichen Herbaria
Flavoparmelia caperata description by Thomas H. Kent, last updated 25 May 2020.