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 Thallus: foliose, forming orbicular rosettes, up to 5 mm diam., on fibrous, well-developed hypothallus that sometimes extends as a blue-black zone around the thallus; lobes: mostly concave, 3-4 mm wide, up to 8 mm long, with raised, whitish margins that are deeply incised; upper surface: bluish gray to fawn-colored (olive-brown), smooth to pruinose or sometimes scabrous at the apices; upper cortex: paraplectenchymatous, 40-50 µm thick; Apothecia: common, frequently centrally, up to 1.5 mm; disc: red-brown, with a persistent, crenulate thalline margin; exciple: subparaplectenchymatous, 30-40 µm thick; hymenium: primarily hyaline but brown above, partially I+ blue (in vicinity of the asci), 110-150 µm high; asci: clavate to subcylindrical, without internal amyloid apical structures, 8-spored; ascospores: simple, colorless, broadly ellipsoid, with an epispore, 20-24 x 10-12 µm (with epispore); Pycnidia: not seen; Spot tests: thallus K-, C-, KC-, P+ orange; Secondary metabolite: pannarin.; Substrate and ecology: on bark in cool-temperate forests; World distribution: widespead in both Northern and Southern Hemispheres; Sonoran distribution: at the upper limit of the oak forests in Sinaloa and Chihuahua, sometimes extending into the conifer forests.; Notes: It is mostly confused with P. lurida and P. subfusca. The former species is usually broader and has duller lobes, that are heavily wrinkled when dry. In contrast, P. subfusca is a smaller, thinner, brownish, P- species. The separation from the smaller, often abundantly fertile P. malmei Dodge, which is best recognized by its smaller spores (12-15 x 8-9 µm), is more difficult. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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