Xanthoparmelia arida

Xanthoparmelia arida is a lichen which belongs to the Xanthoparmelia genus. The lichen is an arid shield lichen and is uncommon. It is listed as apparently secure by the Nature Conservatory. It is noted for being similar to Xanthoparmelia joranadia.

Description
Grows to around 3–8 cm in diameter with board dull yellow-green sub irregular lobes that extend 1–3 mm wide. The underside is pale brown with simple rhizines approximately 0.3-0.6 mm long.

Habitat and range
Found in the North American southwest particularly in the US state of Texas.

Chemistry
Xanthoparmelia arida has been recorded containing both Lecanoric and usnic acids.