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 Thallus: adnate, foliose, 4-20 cm in diam., lobate; lobes: sublinear, contiguous, elongate, plane to subconvex, separate, 2-4 mm wide, apices truncate; upper surface: gray (to brown in exposed habitats), smooth to foveolate, shiny, sometimes white pruinose, becoming cracked along prominent, effigurate pseudocyphellae; isidia: cylindrical, simple to coralloid, abundant, laminal, dense; soredia and pustulae absent; medulla: white with continuous algal layer; lower surface: black, rhizinate, rhizines: moderately dense, black, simple to furcate; Apothecia: rare, laminal, 2-8 mm wide; margin: usually isidiate; disc: red-brown to dark brown; asci: clavate, 8-spored; ascospores: ellipsoid, 16-18 x 9-11 µm; Pycnidia: not seen; Spot tests: upper cortex K+ yellow, C-, KC-, P+ yellow; medulla K+ yellow turning deep red, C-, KC-, P+ orange; Secondary metabolites: upper cortex with atranorin and chloroatranorin; medulla with salazinic acid (major) and consalazinic acids (minor).; Substrate and ecology: on rocks in open habitats, rarely on trees; World distribution: pantemperate and southern boreal; Sonoran distribution: relatively rare on scree rocks in upper montane habitats, Arizona. 


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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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