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DescriptionThallus: single lobed, consisting of small lobes (squamules) which are 2-6 mm in diameter; upper surface: gray with epinecral layer consisting of airfilled hyphae; upper cortex: 60-120 µm thick, hyaline with the outermost part (10-20 µm) brown; algal layer: 60-90 µm thick mainly located in lower part of upper cortex; medulla: 30-180 µm thick, consisting of dense hyphae; lower cortex: 40-120 µm thick.; lower surface: brown to dark brown, usually smooth; Perithecia: broadly obpyriform to globose, 200290 µm high and 160-260 µm wide, with hyaline exciple which is brown at the uppermost and outermost edge; asci: clavate or cylindrical, 8-spored; ascospores: simple, 13-20 x 5-8 µm; Pycnidia: fairly common, immersed, ostiolum similar to that of the perithecium; conidia: bacilliform, 4-5 x 1 µm; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on rocks of different types, often in seepages or in shade; World distribution: Northern America and Europe; Sonoran distribution: eastern Arizona and southern California.; Notes: Dermatocarpon leptophyllodes is characterized by the small lobes which can be squamulose in appearance.