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Description

 Thallus: crustose, leprose, irregular, indeterminate, firmly fastened to the substrate, forming a thin layer of soredia; lobes not evident; upper surface: gray-green, blue-green or gray-blue, dull; soredia: mostly farinose, up to 70(-110) µm in diam., fluffy, sometimes with shortly projecting hyphae; medulla: absent; lower surface: not evident, without tomentum; Spot tests: thallus K- , C-, KC- , P-; UV+ bluish white; Secondary metabolites: atranorin, zeorin, divaricatic and nordivaricatic (trace accessory) acids.; Substrate and ecology: on bark, including Quercus agrifolia and Lithocarpus densiflorus; World distribution: Africa, Asia, Europe, North America, South America and New Zealand; Sonoran distribution: southern California from near sea level to 400 m. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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