Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Thallus: verrucose, with moderately thick verrucae, margins: indefinite, unzoned to seldom zoned upper surface: yellow-green to sulfur yellow, smooth to rugose, dull to slightly glossy, epruinose to slightly grayish pruinose soredia: whitish green to whitish gray, often with a bluish glimmer, in orbicular soralia, 0.5-2.0 mm in diam. Apothecia: no fertile specimens seen Pycnidia: not seen Spot tests: K+ yellow to red, C+ orange, KC-, P+ yellow to orange, UV+ orange-red Secondary metabolites: norstictic and thiophaninic acids (both major), connorstictic acid, 2-chloro-6-O-methylnorlichexanthone and 4-chloro-6-O-methylnorlichexanthone (all minor). Substrate and ecology: Pertusaria azulensis grows on dead wood, and sometimes on Pinus bark World distribution: endemic to North America from central Mexico to SW USA Sonoran distribution: restricted to mountainous areas of Arizona at 1900 to 2800 m. Notes: This species is easily identified by the yellowish thallus, the definite, orbicular soralia and the presence of the norstictic and thiophaninic acids chemosyndromes. It is hardly confusable with any other Pertusaria species in North America.