Anamorph: Microxiphium sp. Colonies composed of hyphae with many constricted septa, hyphal cells rounded. Setae to 230 µm widening to 6-10 µm at the base, straight, tapering, acute, dark brown, simple, smooth, with a bulbous base, inserted in a small pad of brown-walled polyhedral cells and sheathed with a cortex of hyphae. Conidiomata absent, conidiogenesis localised on the upper part of the setae. Conidiogenous cells integrated, determinate, blastic, possibly phialidic, intercalary, hyaline. Conidia 2-3 µm diam, globose to narrowly ellipsoidal, hyaline, simple, smooth.
Teleomorph: Stromata absent. Ascomata to 300 µm, perithecioid, globose, not or slightly papillate, collapsing in a cupulate manner on drying, black, smooth, with or without a hyphal cortex, scattered, superficial on a subiculum composed of branched and anastomosed hyphae that is sometimes so dense as to form a membrane, hyaline to pale yellow brown and with numerous erect setae, superficial on adaxial surfaces of living leaves. Peridium composed of polygonal cells with yellow-brown walls. Interascal tissue composed of hyaline filaments. Asci 50-60 x 10-18 µm, clavate, thick-walled with two observable layers, J-, 8-spored, with a foot-shaped base. Ascospores 15-20 x 5-7 µm, 3- to 5-septate (mostly 3), narrowly ellipsoidal to ovoid, somewhat irregular, hyaline, smooth, not constricted at the septa.