Anamorph: not known. Teleomorph: stromata originating in the algal layer of the host, erumpent through the cortex and superficial from an early stage, carbonaceous, black, uni- or multiloculate, the ascomata mainly 500-700 µm tall and 250-400 µm diam., discrete, aggregated and arising in groups, irregularly obovoid, very coarsely verrucose, broad, short-stalked, ostiolate; the ostiole broad and irregular, lined with periphyses 1.5-2 µm diam. Peridium 75-125 µm thick but very uneven, formed of many layers of angular cells, the cells 10-20 µm diam., dark brown to almost black towards the outside, thick-walled, the inner layers paler and thinner-walled, each cell with one or more pores 1-1.5 µm diam. forming channels between adjacent cells. Interascal tissue absent. Asci arising in a dense fascicle from the base of the perithecial cavity, 100-140 x 14-18 µm, elongate-clavate, the apex obtuse to acute, with a long tapering stalk, thin-walled, not fissitunicate, without any distinct apical structures, not blueing in iodine, 2-to 4-spored. Ascospores irregularly arranged, 28-39 (-41) x 8-11 (-12) µm, irregularly shaped but mostly broadly fusiform or cylindric-fusiform, sometimes with irregular apiculi, 3 (-4)-septate, slightly constricted at the septa, golden brown to olivaceous with paler terminal cells, smooth- and thick-walled, without an epispore or gelatinous sheath.