Flavoparmelia baltimorensis, the rock greenshield lichen (from Lichens of North America), is a medium to large foliose lichen with a yellow green upper thallus surface when dry; its lobes are rounded without pseudocyphellae; and the upper surface is covered with globose, pustule-like growths resembling isidia. The lower surface is black with a narrow brown zone at the margins.
From Wikipedia, under CC BY-SA 4.0.
Is it poisonous?
We have no record of Rock greenshield lichen being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.
Easily confused with
- Flavoparmelia haysomii
- Xanthoparmelia plittii
- Flavoparmelia soredians
- Flavoparmelia caperata
- Xanthoparmelia tinctina
Classification
- Kingdom
- Fungi
- Phylum
- Ascomycota
- Class
- Lecanoromycetes
- Order
- Lecanorales
- Family
- Parmeliaceae
- Genus
- Flavoparmelia
- Species
- Flavoparmelia baltimorensis
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