Description ²

 Thallus: adnate, foliose, 4-10 cm in diam., lobate; lobes: sublinear, contiguous, elongate, plane to subconvex, separate, 2-5 mm wide, apices truncate; upper surface: whitish gray, smooth to slightly ridged, matt, frequently densely pruinose, becoming cracked along prominent, effigurate pseudocyphellae; isidia: granular to subsorediose, laminal, dense; soredia and pustulae absent; medulla: white with continuous algal layer; lower surface: black, rhizinate; rhizines: moderately dense, black, simple to sparsely furcate; Apothecia: rare, laminal, substipitate, 2-4 mm wide; margin: usually isidiate; disc: red brown to dark brown; asci: clavate, 8-spored; ascospores: broadly ellipsoid, 14-16 x 9-12 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 trees; World distribution: Pacific NW in North America down to southern California; Sonoran distribution: only known from a few locations in southern California. 

Sources and Credits

1. (c) Richard Droker, some rights reserved (CC BY-NC-ND), http://www.flickr.com/photos/29750062@N06/4193490430/
2. (c) Lichen Unlimited: Arizona State University, Tempe., some rights reserved (CC BY-NC-SA), http://eol.org/data_objects/10547670

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• CalPhotos
• Global Biodiversity Information Facility (GBIF)
• Mushroom Observer
• NatureServe Explorer 2.0
• SEINet Symbiota portals
• USDA PLANTS database
• Ways of Enlichenment

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