Flavoparmelia caperata - Relatively large size, yellow-green color, wrinkled upper surface that has white marks that frequently blister and/or produce coarse granules. These are pretty good ID characters for this common U.S. lichen.
JJ Johnson
2014-05-00
Sat May 17 2014 18:39:42 GMT-0700 (PDT)
United States of America, California, Presidio, Presidio of San Francisco, San Francisco County, Golden Gate National Recreation Area, US-CA, US