Ampliotrema cocosense Lücking & Chaves  

Mycobank MB 517732

Thallus grey-olive-yellow, verrucose, with dense, paraplectenchymatous cortex; photobiont layer and/or medulla with clusters of calcium oxalate crystals. Apothecia sessile, rounded, 1–2 mm diam.; disc partially covered by 0.3–0.6 mm wide pore, brown-black, yellow- to orange-pruinose; margin entire, fused, yellowish white, covered by thalline layer. Columella absent. Excipulum paraplectenchymatous, carbonized; periphysoids absent. Hymenium 150–200 µm high, inspersed; paraphyses apically branched. Ascospores 4–8/ascus, richly muriform, 80–100 x 17–22 µm, oblong, with thick septa and rounded lumina, colourless, I+ violet-blue (amyloid). Secondary chemistry: protocetraric and virensic acid and satellites; thallus (medulla) C–, K–, P+ orange-red.