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DescriptionThallus: foliose, single lobed attached by a single umbilicus and with 11-45 mm wide lobes; upper surface: gray, with epinecral layer consisting of air filled hyphae; upper cortex: 100-180 µm thick, hyaline with the outermost 1020 µm part brown; algal layer: 50-140 µm thick; medulla: 170-380 µm thick, of filamentous hyphae turning red with Melzer's iodine; lower cortex: 50-110 µm thick, with the outermost 10-20 µm brown; lower surface: light to dark brown, with rhizinomorphs; rhizinomorphs: 50-130 µm thick, with medullary layer in the center; Perithecia: broadly obpyriform to globose with hyaline exciple which is light brown to brown in the uppermost part; asci: clavate or cylindrical, 8-spored; ascospores: simple, hyaline, 1015 x 4-7 µm; Pycnidia: not found; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on different rock-substrates although the majority of the Sonoran specimens grew on sandstone; World distribution: northern Africa, Mongolia, and North America; Sonoran distribution: scattered throughout Arizona.; Notes: Dermatocarpon schaechtelinii differs from Dermatocarpon moulinsii in having thicker rhizinomorphs and having a medulla within the cortex layer. See D. moulinsii for further comments on differences between the two species.