Thallus: verrucose-areolate to rimose-areolate, with thin to moderately thick verrucae; margins: entire, unzoned upper surface: yellowish gray to yellowish white, smooth, dull to shiny, epruinose; lacking soredia or isidia fertile verrucae: concolorous with thallus, pertusariate, flat-topped, numerous, c. 0.4-1.0 mm in diam.; ostioles: 1-4 (-6) per verruca, slightly sunken, grouped in a central depression and fusing to form a pseudolecanorate discs, c. 0.5 mm wide Apothecia: 1-2 per verruca, up to 0.5 mm in diam.; disc: dark brown to gray brown, epruinose; epithecium: dark brown; hypothecium: hyaline asci: cylindrical, 180-260 x 40-64 µm, 2-spored, uniseriate ascospores: hyaline, ellipsoid, 86-118 x 32-58 µm; spore walls: c. 6-10 µm thick; apices: up to 14 µm thick, 2-layered; outer spore wall: c. 1-2 µm thick; inner spore wall: 5-9 µm thick; apices: up to 28 µm thick 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 (minor). Substrate and ecology: in montane oak-pine forests on Quercus bark, associated species include Lecanora caesiorubella and Ochrolechia spp. World distribution: endemic to North America Sonoran distribution: known only from a few localities in Baja California Sur, Sinaloa and Sonora at 1600 and 2300 m. Notes: Pertusaria neolecanina is characterized by its verruciform ascomata with blackish ostioles, two-spored asci and the presence of norstictic and thiophaninic acids. Chemically it agrees with P. lecanina which also has two-spored asci. This species, however, is readily distinguished by its disciform apothecia and the single-layered ascospores. Another similar species is P. xanthodes, that, however, differs in containing stictic acid instead of norstictic acid and not forming pseudolecanorate discs.