Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.

Thallus: foliose, single lobed attached by a single umbilicus and with 14-60 mm wide lobes upper surface: gray, with epinecral layer consisting of air filled hyphae upper cortex: 130-240 µm thick with the outermost 10-20 µm brown medulla: 180-350 µm thick lower cortex: 90-110 µm thick with the outermost 15-40 µm brown, the lower cortex cells are angular and in distinct vertical columns, uneven lower surface were 2-4 cell rows thick outgrowths cause the farinose lower surface of the species lower surface: brown, farinose and often reticulate, occasionally with rhizinomorphs Perithecia: obpyriform to almost globose, 200-530 x 170-440 µm, primarily with a hyaline exciple that is light brown to brown in the uppermost part, rarely hyaline throughout asci: clavate or cylindrical, 8spored ascospores: simple, hyaline, 12-17 x 5-9 µm Pycnidia: not found in Sonoran material, elsewhere immersed, ostiolum similar to that of the perithecium conidia: bacilliform, 4-6 x 1 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on different rock-types, often on boulders and occasionally in seepages World distribution: western North America Sonoran distribution: throughout Arizona and southern California. Notes: Dermatocarpon reticulatum is unique in the genus in having farinose lower surface which often also is reticulate.