Xanthoparmelia mexicana (salted rock-shield) is a foliose lichen that grows in 4–10 cm diameter rosettes of gray-green to yellow-green lobes in arid climates all over the world. It grows on acidic rock and soil, in open and arid habitats all over the world. It may loosely cling to the substrate (adnate). It grows in 4–10 cm diameter rosettes of lobes, with lobe tips lighter in color than the center of the rosette. The lower surface is pale to...