Thallus: crustose, verruculose, rimose, coherent, 0.2-1 mm thick upper surface: greenish-white; soralia often developed, at first punctiform to maculiform but when old often confluent cortex: hyphae mixed and intertwined but sometimes more or less anticlinally arranged in the upper part, 20-40 µm thick Ascomata: numerous or absent, circular in outline, sessile with constricted base, 0.5-2 mm diam; disc: exposed, flat or concave, white pruinose; exciple: crenulate or strongly crenulate, conspicuously protruding above the disc, algae and cortex present; proper exciple: conspicuous, dark-brown (carbonaceous), up to 100 thick; epithecium: 10-15 µm thick, pale brown; hymenium: 50-65 µm high, paraphysoids: richly branched and intertwined, tips 2 µm diam. but c. 1 µm diam. below; hypothecium: dark-brown (carbonaceous) asci: clavate, 50-60 x 10-15 µm ascospores: fusiform, straight or curved, hyaline, multi-septate usually with 7-11 septa, 22-38 x 4-6 µm Pycnidia: not seen Spot tests: thallus K-, C+ red, KC+ red, P- Secondary metabolite: lecanoric acid. Substrate and ecology: mostly found on dead twigs and branches but also on bark of different shrubs and trees near the ocean World and Sonoran distribution: sparsely distributed along the coast from Monterey County, California, in the north to central Baja California in the south. Notes: This species is often wholly sorediate but then usually with rudimentary apothecia also present. Completely sorediate individuals may be difficult to distinguish from sorediate individuals of Sclerophyton californicum which may grow in the same habitat. However, the thallus of "Schismatomma" pluriloculare is verruculose and is more greenish. The use of the quotes about the generic name indicate that the placement in this genus is not completely certain.