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DescriptionThallus: foliose, small, 1-1.5 cm in diam., adnate; lobes: +flattened (0.5-1 cm wide and up to 1 cm long), imbricate or separate; tips: rounded to subtruncate; upper surface: gray or blue-gray to brown when dry, bluish gray when wet, isidiate; isidia: laminal, peltate; medulla: white, with +loosely interwoven hyphae; photobiont: Nostoc; lower surface: white, with anastomosing pale, smooth, flattened veins, rhizinate; rhizines: pale to medium brown, irregular, bushy or penicillately branched; Apothecia: not seen in Sonoran material, also elsewhere rare, up to 7 mm in diam.; asci: cylindrical, Peltigera-type, 8-spored; ascospores: colorless to pale brown, acicular, 3(-5) septate, 50-60 x 4-5 µm; Pycnidia: not seen in Sonoran material; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on soil in dry habitats; World distribution: temperate and boreal regions of North America, Europe and Asia, South America, Australia, and Hawaii; Sonoran distribution: rare in central Arizona (1600 m).; Notes: Peltigera lepidophora is easily distinguished by its laminal, peltate isidia, but its small thalli are easily overlooked.