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 Thallus: continuous to fissured or fissured-areolate, with very thin or thin to moderately thick verrucae; margins: entire, often zoned; upper surface: ash gray to dark gray, smooth to tuberculate, shiny, epruinose; soredia: restricted to verrucae; fertile verrucae: sorediate, concolorous with thallus, lecanorate, numerous, sometimes fusing, c. 0.4-1.2 mm in diam.; Apothecia: 1 (-4) per verruca; disc: blackish brown, level to sunken, whitish pruinose, later totally sorediate; epithecium: dark brown to black, K-; hypothecium: yellowish; asci: clavate to cylindrical, 110-240 x 40-80 µm, 1-spored; ascospores: hyaline, ellipsoid to cylindrical, 85-190 x 25-65 µm; spore wall: c. 2-12 µm thick, 1-layered; Pycnidia: immersed; conidia: bacilliform, 4-7 x 0.5-1.0 µm; Spot tests: K-, C-, KC-, P-, UV-; Secondary metabolites: no phenolic substances detectable.; Substrate and ecology: on bark of numerous phorophytes, including Abies, Alnus, Juniperus, Pinus, Pseudotsuga, and Quercus, but also occurs on dead wood; World distribution: circumboreal; Sonoran distribution: coastal California and mountainous areas of Arizona, Chihuahua and Sinaloa at 2000 to 3000 m.; Notes: Pertusaria ophthalmiza is characterized by a gray thallus with lecanorate verrucae with a crenulate margin, a white pruinose disc which soon becomes sorediate, single-spored asci and the absence of phenolic compounds. It is hardly confused with any other Pertusaria species in southwestern North America. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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