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Description

 Thallus: foliose, loosely adnate, bluish-gray, turning buff in the herbarium with age, lobate; lobes: subirregular, contiguous, plane, 2-4 mm wide, apices truncate; upper surface: gray to yellowish gray, only lobe tips sometimes tinged brown, smooth, dull, sometimes white pruinose, especially towards the lobe tips; pseudocyphellae: numerous, conspicuous, white, circular to rounded, laminal, reaching 0.3 mm; soredia: granular, capitate to irregular, grayish-white, originating from pseudocyphellae, mostly laminal, occasionally also marginal, up to 0.5 mm in diam.; lower surface: usually black centrally, brown marginally, rhizinate; Apothecia: unknown from the area; Pycnidia: absent; Spot tests: upper cortex K+ yellow, C-, medulla K-, C+ rose , KC+ rose; Secondary metabolites: upper cortex with atranorin (minor or trace); medulla with gyrophoric acid (major) and orcinyl lecanorate (=decarboxygyrophoric acid) (minor).; Substrate and ecology: rare on bark of Quercus from 300 to 410 m; World distribution: probably cosmopolitan, known from North and South America, Europe, Africa, Asia and Australia; Sonoran distribution: rare in southern California and the Channel Islands. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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