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Description

 lobes: linear, elongate, ± narrow, 0.5-1 (-2) mm wide, subimbricate centrally, ciliate; cilia: prominent, marginal, pale at the base and blackened towards the branched apices; upper surface: gray to dark gray without or with a weak pruina, sometimes with laminal cilia; sorediate; soredia: in soralia on the underside near the tips, bending the tips upwards and thus appearing labriform (designated capitate by Kurokawa [1962]); upper cortex: prosoplectenchymatous; medulla: white above and salmon below; lower cortex: lacking; lower surface: white but mostly overlaid by a yellow to salmon-colored pigment (K-), arachnoid, rhizinate; rhizines: marginal, simple; Apothecia and Pycnidia: not seen; Spot tests: cortex K+ yellow, C-, KC-, P+ yellow; medulla K+ yellow, C-, KC-, P-; Secondary metabolites: cortex with atranorin and chloroatranorin; medulla with atranorin, zeorin and leucotylin.; World distribution: North America from the southern Appalachian Mountains; Sonoran distribution: relatively rare in SE Arizona and Baja California Sure, more common in the Sierra Madre Occidental region of Sonora and Chihuahua. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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