Thallus of dispersed brown, often grey pruinose, bullate areoles (0.13)0.150.2 mm across; growing over Andreaea sp. Cortex not clearly defined but cortical cells brown, 5 m across. Medulla I. Photobiont chlorococcoid, cells 812(15) m.
Apothecia black, lecideine, rounded, occasionally somewhat angular, flat 0.50.7 mm diam., proper exciple thick (0.5 mm), raised and persistent. Thecium hyaline, I+ blue, 130140m tall; epihymenium 10–15 m thick, pale brownish; paraphysoids 1.01.5 m thick, septate and moniliform, richly branched and anastomosing, apices swollen to 4 m with dark cap. Asci c. 5560 2030 m, broadly sylindrical to sub-clavate, Rimularia-type;ascospores hyaline, simple, 8/ascus, 1518(21) 1012 m, thick-walled (c. 1 m thick). Hypothecium pale- to mid-brown merging into the exciple. Excipulum dark brown, cupular, 100 m wide.
Conidiomata not seen.

Chemistry: C, K, KC, Pd. No substances detected by TLC, but material very scanty.

Known only from the Falkland Islands, where it grows over Andreaea spp.

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