Thallus: crustose, thin, finely granulose, often immersed, dispersed; prothallus: indistinct; granules: c. 0.1 mm in diam.; surface: white-gray, pale to dark gray or gray-brown, esorediate; cortex: absent or thin and indistinct; photobiont: globose, 7-13 µm wide; Apothecia: broadly adnate, (0.15-)0.3-0.5 mm in diam., not grouped; disc: dark brown to black, flat to depressed-convex, epruinose, dull; margin: thin, finally disappearing; exciple: lenticularis-type, with mostly thin pale to dark brown marginal zone composed of the pigment caps of the hyphal end cells, not carbonaceous; epihymenium: brown-black, K- or almost (sometimes becoming violaceous only for a few minutes, N-; hymenium: hyaline, 30-40 µm tall; paraphyses: easily free, not branched, the tips distinctly clavate thickened with dark brown pigment cap (pigment deposited within the hyphal wall); hypothecium: pale brown at least in upper part; asci: clavate, c. 35 x 10 µm, 8-spored; ascospores: hyaline, becoming 1-septate, oblong-ellipsoid, 8-12 x (2-)2.5-3.5(-4) µm; Pycnidia: unknown; Spot tests: thallus K-, C-, KC-, P-; Secondary metabolites: none detected by TLC.; Substrate and ecology: on deciduous trees with acidic bark, often on eutrophic bark of isolated trees, with wide ecological amplitude, in Mediterranean and cool temperate climates; World distribution: Europe, western North America, and New Zealand; Sonoran distribution: Arizona and southern California..; Notes: Catillaria nigroclavata is similar to C. lenticularis but has a brown hypothecium and occurs on bark. It differs from the also corticolous C. glauconigrans (and C. endochroma) especially in having a lower hymenium. A number of collections identified as this species proved to be misidentifications, including species now placed in other genera (see key above). Superficially it may look like Buellia punctata, whose spores are, of course, brown. 

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

Canada

Rounded National Status Rank: NNR - Unranked

Rounded Global Status Rank: GNR - Not Yet Ranked