There are abundant small white spots & cracks on the lobe surfaces in your photo; these are the "punctae" of Flavopunctelia. when the white spots are absent, the yellowish color would lead you to Flavoparmelia.
Brittany Burson
2014-03-00
Mon Mar 17 2014 16:57:47 GMT-0700 (PDT)
United States of America, California, Briones Regional Park, Lafayette, CA, US