Ocellularia albobullata Lücking, Sipman & Grube  

Mycobank MB 517800

Thallus white-grey, bullate, with dense, prosoplectenchymatous cortex; photobiont layer and/or medulla with clusters of calcium oxalate crystals. Apothecia prominent, angular-rounded to irregular, 0.7–1.2 mm diam.; disc covered by narrow, 0.2–0.3 mm wide pore, filled by brown, white-pruinose pseudocolumella; margin annulate, white, laterally covered by thick thalline layer. Pseudocolumella present, irregular, brown, white-pruinose. Excipulum prosoplectenchymatous, orange-brown; periphysoids absent. Hymenium 60–80 µm high; paraphyses unbranched. Ascospores 8/ascus, 3–5-septate, 10–20 x 6–9 µm, ellipsoid, with thick septa and lens-shaped lumina, colourless, I+ violet-blue. Secondary chemistry: psoromic, subpsoromic and 2'-O-demethylpsoromic acids (C–, K–, P+ yellow).