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Description

 Thallus: foliose, often forming a cushion, 2-5(-8) cm in diam., adnate, irregularly lobate; lobes: irregular, elongate, +plane, separate or more usually imbricate, 1-3(-5) mm wide, 60-135 µm thick; apices: rotund, entire to irregularly cut or lobulate, usually suberect to erect; upper surface: dark brown or reddish brown or in sheltered situations grayish brown, dull centrally and shiny marginally, roughened or irregularly wrinkled, not isidiate; internal anatomy: with upper and lower cortices consisting of a single layer of irregularly isodiametrical cells 5-9 µm in diam., internally with loosely interwoven chains of Nostoc and hyphae; lower surface: pale to medium gray or brown, wrinkled, with scattered tufts of white hairs; Apothecia: common, laminal, sessile, 0.2-0.5(-2) mm wide; disc: light to dark brown, concave to plane; margin: thalline, concolorous with the thallus, entire to wrinkled periclinally; exciple: euparaplectenchymatous, 10-35 µm thick centrally; hymenium: hyaline below and thinly brown above, 115-170 µm tall; paraphyses: unbranched, c. 1 µm wide, slightly inflated apically; subhymenium: yellow to pale brown, 10-50 µm thick; asci: cylindrico-clavate, 8-spored; ascospores: hyaline, muriform, 5-7(-9)-septate transversely, 1-2-septate longitudinally, ellipsoid to subfusiform, (22-)25-35(-42) x (11-)12-14(-17) µm; Pycnidia: not observed; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: among mosses over rocks, particularly limestone; World distribution: very common in Europe, North America and India; Sonoran distribution: Arizona and southern California. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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