On stones on old rock wall
The more greenish one. I put the more grayish one in for comparison (I observed that the day before).
Found this at knights Ferry
On landscape Quercus
On the trunk, Cortex w. Usnic acid (KC+) Yellowish, Medulla with Protocetraric Acid (PD+) red
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...