Conidial morph not known.
Stromata absent. Ascomata perithecia, 220-300 µm diam. and 270-310 µm high, scattered, immersed beneath a small but quite conspicuous black clypeus which is penetrated by a small conical papilla. Clypeus is formed from dark thick-walled hyphae in the upper and side walls of the epidermal cells. Peridium ca 15 µm thick with an outer layer of dark thick-walled cells and an inner layer of hyaline thin-walled compressed cells. Interascal tissue composed of copious gradually tapering unbranched thin-walled paraphyses to ca 4 µm diam. near the base. Asci 105-130 x 14-16 (-19) µm [90-150 x 9-13 (-18) µm fide Francis 1975], cylindrical, rather short-stalked, fairly thin-walled and not fissitunicate, the apex obtuse with an apical ring 3-4 µm diam. and ca 1 µm thick [4 x 3 µm fide Francis 1975], 8-spored or rarely 4-spored. Ascospores arranged obliquely uniseriately, rather variable in size and with the discharged spores shorter and broader than those within the asci; 15.5-17 (-19) x (7-) 8-10 µm [15-23 x 7-9 µm fide Francis 1975], ellipsoidal, slightly inaequilateral, dark brown, smooth, with a germ slit running the length of the spore on the flattened face, with a broad gelatinous sheath to ca 3 µm thick.
Description adapted in part from Francis (1975).
Not formally assessed; the species is rarely encountered but could well be overlooked.
In dead culms of monocot plants, including Carex pendula, Cladium mariscus, Glyceria sp., Juncus articulatus, Luzula sylvatica, Miscanthus sinensis and Typha sp. Presumably a saprotroph, though perhaps also an endophyte.
Reported from VC2 E Cornwall, VC6 N Somerset, Norfolk [VC not known], VC97 Wester Ness and Rhum (VC104 N Ebudes).