Thallus of ±dispersed brown, often grey pruinose, bullate areoles (0.13–)0.15–0.2 mm across; growing over Andreaea sp. Cortex not clearly defined but cortical cells brown, 5 µm across. Medulla I–. Photobiont chlorococcoid, cells 8–12(–15) µm.
Apothecia black, lecideine, rounded, occasionally somewhat angular, flat 0.5–0.7 mm diam., proper exciple thick (0.5 mm), raised and persistent. Thecium hyaline, I+ blue, 130–140µm tall; epihymenium 10–15 µm thick, pale brownish; paraphysoids 1.0–1.5 µm thick, septate and moniliform, richly branched and anastomosing, apices swollen to 4 µm with dark cap. Asci c. 55–60 × 20–30 µm, broadly sylindrical to sub-clavate, Rimularia-type;ascospores hyaline, simple, 8/ascus, 15–18(–21) × 10–12 µm, thick-walled (c. 1 µm thick). Hypothecium pale- to mid-brown merging into the exciple. Excipulum dark brown, cupular, 100 µm 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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