Anamorph: conidiomata acervular, subcuticular, separate or confluent, formed of pale brown to hyaline thin-walled angular cells, the host cuticle discoloured. Conidiophores absent. Conidiogenous cells arising from the upper cells of the angular cells of the lower wall,
7-12 x 2-3 µm, flask-shaped to near-cylindrical, hyaline, smooth, proliferating percurrently, collarette and periclinal thickening inconspicuous. Conidia 5-9 x 2-2.5 µm, fusiform, straight, hyaline, thin-walled, smooth, without guttules. Teleomorph: stromata 0.5-1 mm diam., discoid, flat, visible on both sides of the host leaf, only the outer layers melanized, gregarious, containing 1-3(-6) perithecia. Ascomata perithecia, 200-300 µm diam., 100-150 µm high; neck lateral, initially papilliform and scarcely emerging beyond the level of the substrate but later reaching a maximum height of 120 µm. Peridium 8-13 µm thick, composed of 3-4 layers of dark-walled angular cells. Interascal tissue absent. Asci produced horizontally within the perithecium, 130-150 x 5.5-8 µm, cylindrical with a rounded apex, tapering at the base, apically somewhat thick-walled, with a single discernable wall, with a I- refractive apical ring, 8-spored. Ascospores often lying in a twisted fascicle within the ascus, 122-142 x 1.5 µm, filiform, tapering towards the ends, hyaline, smooth, thin-walled, 3- to 5-septate, not constricted at the septa, without a gelatinous sheath or appendages.