Xanthoparmelia maricopensis, the Maricopa rock-shield, is a 2–6 cm (0.8–2.4 in) wide, yellow-green foliose lichen in the Parmeliaceae family.
It grows on igneous rock in southwestern North American deserts.
[1][2][3] The thallus is tightly attached to the substrate, with irregular somewhat shiny 1–2 mm lobes.
[2] It differs from Xanthoparmelis dierythra in that it has hyposalazinic acid and the lobes are usually more narrow and convex.
[2] In Joshua Tree National Park it grows on non-calcareous rock, soil, basalt, gneiss, and monzogranite.