Growing on sandstone
Found growing on a single tree stump in a temperate woodland environment. Had what looked like patches of decomposition.
A type of foliose (leaf-like) lichen
Common Greenshield Lichen (Flavoparmelia capaerata)
30 July 2016
Enchanted Rock State Natural Area
Gillespie and Llano Counties, Texas
Virtually ubiquitous in all of the state's natural areas, Common Greenshield Lichen was observed growing on Mesquite trees at Enchanted Rock State Natural Area.
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...