There were two isidiate Xanthoparmelia species from the inventory: X. mexicana and X. conspersa. THe main difference in the key is that conspersa has a dark brown to black lower surface, and mexicana is pale to medium brown. So we can actually ID yours!
JJ Johnson
2017-01-00
2017/01/28 1:15 PM PST
United States of America, California, Tehama County, CA, USA