Thallus wide-spreading, thin, 0.1 mm thick, areolate; areoles flat, pale yellow-green, 0.5-1.2 mm across sub-divided into 5-6(-12) subareoles 0.1-0.4 mm across, dispersed on a black prothallus. Medulla I+ violet. Photobiont chlorococcoid, cells globose, 8.5-12 µm diam.
Apothecia abundant, flat to slightly concave, round, 0.1-0.15 mm across, mostly pale- to red-brown, remaining immersed in the thallus, occasionally with a pale thalline margin when young. Excipulum> thin and poorly developed, completely hyaline. Hypothecium hyaline, thin 30-35 µm, composed of randomly orientated hyphae, beneath this there is a thin brown (K+ purple-red, N+ red-brown) layer and then a dark blue (K+ grey, N+ red-brown) layer (?prothallus). Hymenium hyaline, I+ blue, 100-120 µm thick; epihymenial zone not observed. Paraphyses sparingly branched and anastomosing, slender 1.5-2.0 µm wide, septate, cells 5-7 µm long, apices scarcely swollen and unpigmented. Asci cylindrical, c. 45-55 x 12-15 µm, Lecanora-type. Ascospores >hyaline, simple, oblong to broadly ellipsoid, (7.5-)8.5-10.0(-11.5) x (4.0-)4.5-5.5 µm, with rounded apices.
Conidiomata pycnidia, immersed in the areoles, 0.03-0.04 mm diam., pale- to red-brown. Conidia straight, (7.0-) 8.5-10.0 x 0.8 µm.
Chemistry:C—, KC—, K+ yellow, PD—, UV—; usnic acid by TLC.
Known only from Campbell Island.
Associated species include Fuscidea asbolodes, F. subasbolodes, Ionaspis lacustris, Lecidea lygomma, Rimularia maculata, and R. psephota.
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