Thallus: crustose, discontinuous, composed of a few, discrete or contiguous, thin, convex areoles surface: pale gray or pale green Apothecia: at first flat, eventually becoming slightly convex, 0.15-0.4(-0.5) mm in diam. disc: black, epruinose margin: black, often shiny, at first distinct, level with or raised above disc, persistent or finally excluded exciple: laterally 25-35 µm wide, without crystals, blue-green (K-, N+ purple), darkest along edge, fading below, interior sometimes also with some brown merging with the hypothecium pigmentation; edge: with single cell layer of enlarged cell lumina (up to 4 µm wide) epithecium: blue-green (K-, N+ purple), without crystals hymenium: 45-60 µm tall, colorless below, paraphyses: 1-1.5 µm wide in mid-hymenium; apices: ±clavate, 2-5 µm wide, often with distinct hoods of green pigment hypothecium: ±brown (at least partly K+ purplish, N+ orange) asci: clavate, 8-spored ascospores: hyaline, 3-septate (rarely a few 5-septate), clavate to almost bacilliform, straight or curved, 14-27 x 2.3-3.5 µm Pycnidia: half-immersed in thallus, brown, 30-40 µm in diam. conidia: filiform, curved, non-septate, 11-19 x 0.7 µm Spot tests: all negative Secondary metabolites: not investigated. Habitat and ecology: on bark of Malacothamnus fasciculatus in canyons at low elevations World distribution: southern California Sonoran distribution: canyons of the Santa Monica Mountains of southern California (Hasse 1913). Notes: Bacidia veneta is superficially very similar to B. circumspecta, from which it differs above all by its brown hypothecium and its strikingly blue-green proper exciple. Bacidia subincompta and B. coruscans are also similar to B. veneta. Both species differ from B. veneta in their larger apothecial size and the exciple being more well-developed. In addition, B. subincompta differs in having the exciple dominated by a brown pigment, the interior being as dark as or darker than the edge. Bacidia coruscans also differs in having a taller hymenium. Bacidia veneta was treated as part of B. circumspecta by Ekman (1996a). Bacidia jacobi sensu Hasse (1913) is identical to B. veneta. However, B. jacobi (Tuck.) Hasse is a different, distantly related species.