Thallus: rimose-areolate; areoles: 0.4-1.8 mm in diam., plane, thin; upper surface: grayish brown to brown, smooth, shiny or dull, epruinose; Ascomata: perithecioid, immersed, up to 2.5 mm in diam.; disc: blackish, plane; proper exciple: up to 70 µm thick; hymenium: 100-130 µm high; asci: cylindrical to subclavate, 4-6-spored; ascospores: brown, muriform, broadly ellipsoid, 16-26 x 8-18 µm; transverse septa 4-6, longitudinal septa 1-3 per transverse segment; Pycnidia: not seen; Spot tests: K-, C+ red, KC-, P-, UV-; Secondary metabolites: lecanoric acid (major) and orsellinic acid (minor).; Substrate and ecology: on siliceous rocks; World distribution: North and South America, southwestern Europe, and East Asia; Sonoran distribution: scattered in southern California and Arizona, Baja California (Guadalupe Island, Baja California Sur, Chihuahua and Sonora, occurring in mountainous regions at 270 to 2240 m.; Notes: Diploschistes aeneus has perithecioid ascomata, a brownish thallus, contains lecanoric acid, and has broadly ellipsoid spores. It may be confused with D. badius, a species that also has a brownish thallus, but can be distinguished by the presence of gyrophoric acid and the thicker thallus. 

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

Canada

Rounded National Status Rank: NNR - Unranked

Rounded Global Status Rank: G4 - Apparently Secure

Reasons: Known from North and South America, southwestern Europe, and East Asia (Nash et al. 2002). Occurs on siliceous rocks (Nash et al. 2002). In the greater Sonoran Desert region, it is scattered in mountainous regions in southern California, southern Arizona, Baja California, Baja California Sur, Chihuahua, and Sonora (Nash et al. 2002).