Ocellomma picconianum  

Thallus crustose, thin, whitish to grey-brown, smooth or irregularly cracked, not corticate. Photobiont trentepohlioid.
Anamorph: conidiomata pycnidia, 70-90 µm diam., ± superficial, black, globose, copiously produced. Conidiogenous cells in a palisade lining the conidiomatal wall, 3-5 x 2-3 µm, rather irregular in form, apparently proliferating percurrently. Conidia  6-8 × 1.5–2 μm, bacilliform, strongly curved, aseptate, colourless.  
Teleomorph: ascomata apothecia, circular in outline, occasionally irregular in outline, erumpent, becoming sessile, 200-350 (-450) µm diam.,  with a conspicuous thalline margin containing big colourless crystals (probably calcium oxalate); hymenial disc widely exposed, greyish, variably white-pruinose. True exciple rudimentary or very thin. Hypothecium colourless to pale brown, I+ blue, K/I+ violet. Hymenium 80-100 µm thick, epithecium a thick layer of ? oxalate crystals. Hamathecium of branched and anastomosed pseudoparaphyses 1.5-2 µm diam., the apices not or only slightly enlarged. Asci 72-90 x 12.5-15 µm, clavate with a tapering stalk, the apex rounded,thick-walled and fissitunicate but without a clear ocular chamber, with a very broad and shallow apical structure that blues in KOH/Lugol's iodine, 8-spored. Ascospores arranged biseriately or partially in a fascicle, 26-31 x 4.3-5 µm, narrowly fusiform to fusiform-clavate, the apices acute, usually slightly curved, colourless, 3-septate, hardly constricted at the septa, the cells with rounded lumina, without a perispore or appendages.
Chemistry: Thallus K–, C–, P–. Roccellic acid (by TLC).