Stromata developing on the surface of the host thallus, 1.2-2 (-2.5) mm diam, round or somewhat irregular in outline, shallowly convex, irregular especially when overgrowing isidia, the surface matt black, ± bullate. Anamorph: conidiomata pycnidia, immersed in the stroma and ± contemporaneous with the ascomata, 120-180 µm diam., ± globose, with a ± elongate neck. Conidiophores absent or short and unbranched, the conidiogenous cells forming in a palisade lining the conidiomatal wall. Conidiogenous cells 5-7 x 2-2.5 µm, conic-cylindrical, proliferating percurrently. Conidia 3-4 x ca 1 µm, bacillar to obovoid, aseptate, hyaline, thin-walled. Teleomorph: ascomata perithecial, with 5-12 1ocules immersed in each stroma; 150-200 µm diam., with an elongate ostiolar canal 70-100 µm in length extending to the stroma surface, the locule walls not differentiated, the cells similar in structure to those of the stromatal tissue. Interascal tissue well-developed, composed of thin-walled branched cellular pseudoparaphyses 1.5-2 µm diam. Asci 80-100 x 18-22 µm, clavate, thick-walled and fissitunicate, the base tapered and the apex rounded, with an indistinct ocular chamber, not staining in iodine, 8-spored. Ascospores arranged obliquely uniseriately to biseriately, 18-22.5 x 5.5-8 µm, clavate to fusiform-ellipsoidal, often curved, 3- septa. slightly constricted at the median septum and with the outer septa sometimes oblique, dark brown, thick- and smooth-walled, without an epispore or gelatinous sheath.