Common Greenshield Lichen
Pictured with a red Toadskin Liken. Green shield lichen is an unusually pollution-tolerant species. Because of this it is one of the most common lichens in urban areas, growing on the bark of trees.
Found on a tree.
Flavoparmelia caperata or common greenshield lichen (from Lichens of North America) 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 (0.1–0.3 in) 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...