"On Quercus chrysolepis trunk bark. Mid-late mature dwarf forest chaparral of Arctostaphylos spp. /Quercus chrysolepis/Quercus agrifolia/Torreya californica; occasional Chrysolepis chrysophylla. "
Growing on Quercus alba branch.
Yellow green upper surface, dark lower surface
On park bench
Not much lichen in DC city!
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...