Thallus: crustose, thin, indistinct and continuous or granulose; prothallus: dark, indistinct; granules: scattered, small (c. 0.1 mm wide), rounded; surface: greenish gray to ashy, esorediate; cortex: not investigated; photobiont: not investigated; Apothecia: adnate to closely sessile, 0.2-0.45 mm in diam.; disc: pale lead colored to black, flat to convex; margin: concolorous with disc, or brown, persistent or soon disappearing; exciple: externally black to lead gray, brown to pale brown within, radiate; epihymenium: brown, inspersed with discrete, blackish brown granules; hymenium: hyaline, I+ blue then yellow-brown, 60-65 µm tall; paraphyses: coherent to free, the tips partly capitate with darkened caps; hypothecium: red-brown to brownish black, paler than the epihymenium; asci: clavate, 40-44 x 7-8 µm, 8-spored; ascospores: hyaline, 1-septate, oblong-ellipsoid, 6-12(-15) x 2.5-4 µm; Pycnidia: globose; conidia: filiform to arcuate, c. 14 x c. 0.5 µm; Spot tests: thallus K+ yellow; Secondary metabolites: none detected by TLC.; Substrate and ecology: on trees (Abies and Pinus) and shrubs (Rhus diversiloba); World distribution: widely scattered in temperate areas of North America, extending to the subarctic (Thomson 1997); Sonoran distribution: Arizona and southern California.; Notes: Catillaria glauconigrans is characterized by its granulose thallus, dark hypothecium and filiform conidia, which separate it from the core group of Catillaria.