Anamorph: mostly not known, Asteroma-like in one GB&I species. Teleomorph: Stromata discoid or ± lenticular, appearing as flat or slightly raised, black or brown circular spots, prominent on one or both sides of the host leaf, scattered to gregarious, forming a capsule within the thickness of the host leaf lamina, sometimes with the host epidermal cells masked by a dense network of dark, thick-walled, hyphae; composed of a thick outer layer of dense, dark, fungal tissue and an interior of hyphae intermixed with host cells, containing a single ascomata or in one species 1-3(-6) ascomata, which may obscure the stromatic interior. Ascomata perithecia, ellipsoidal, papillate to long-necked, yellowish to brown-black, oblique to horizontal, neck rarely central but more usually lateral, immersed in the stroma with the neck emerging on either surface of the host leaf or sometimes with two opposing necks. The neck is easily damaged and may be absent in dried specimens. Peridium only a few cells thick, composed of relatively thin cells. Interascal tissue absent. Asci produced horizontally within the perithecium, cylindrical with a rounded apex, tapering at the base, apically somewhat thick-walled, with a single discernable wall, with a I- refractive apical ring, 2- to 8-spored. Ascospores filiform, tapering towards the ends, hyaline, smooth, thin-walled, simple or more usually 3- to 14-septate, not constricted at the septa, often with disc-shaped or filiform hyaline appendages at one or both ends, with or without guttules, lying in parallel or in a twisted fascicle within the ascus.
Distinguished from Pleuroceras by the ascomata being contained in a small stroma rather than under a clypeus, but the difference is difficult to detect and preliminary molecular data suggests that the two genera should be merged. However, further research would be advisable before the necessary new combinations are made.