Anamorph: with a variably developed stromatic disc, grey to black, usually with a pronounced and abruptly delimited outer layer, with one or two ostioles, conidial production often copious with yellow-orange tendrils arising from the ostioles. Locule one per stroma, composed of numerous irregular or radiating chambers lined with thin-walled angular cells, from which the short conidiophores arise. Conidiogenous cells lageniform to cylindrical, in clusters of 2-5 on the conidiophores, proliferating percurrently. Conidia 3-7 x 0.75-1 µm, allantoid, aseptate, hyaline. Teleomorph: stromatic disc prominent or reduced, mid brown to dark grey, convex, circular or irregular, with ostioles arranged in a ring around the margin. Outer stromatal layer well-developed, often convex below and delimited abruptly from the inner layer which is sparse and limited to the region near the ascomatal walls. Ascomata perithecia, 2-15(-30) per stroma, 300-450 µm diam., short-necked. Interascal tissue absent, at least at maturity. Asci 35-50 x 6-10 µm, clavate, short-stalked, evanescent at the base, not fissitunicate, the apex truncate with a conspicuous refractive apical ring, 8-spored. Ascospores 8-12 (-15) x 1-3 µm, allantoid, aseptate, hyaline, thin-walled, smooth, without an epispore, gelatinous sheath or appendages.