Xanthoparmelia ahtii
Xanthoparmelia ahtii is a rock shield lichen that belongs to the family Parmeliaceae. One previous name for this species was Neofuscelia ahtii. The lichen is uncommon and is listed as imperiled by the Nature Conservatory. Description 
The lichen grows on rocks and is olive brown to yellow or reddish brown in color. are approximately 1–2.5 mm wide and are slightly curved and broad. Habitat and range 
It is found in the North American southwest growing on rocks. It has been observed in forested areas in the state of Arizona as well as well as the Mexican state of Baja California Sur. See also 

 List of Xanthoparmelia species

References 

ahtii
Lichen species
Lichens described in 1977
Lichens of the Southwestern United States
Lichens of Mexico
Taxa named by Theodore Lee Esslinger