In a sugar maple
I have identified very few of the many, many lichens around here. Most of the tree trunks have some.
growing on a fence post
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...
