Anamorph: conidiomata pycnidial, 200-300 µm diam., often somewhat elongate, immersed in rotten wood and with a short erumpent papillate neck, fairly thin-walled, dark brown, composed of an outer layer of strongly pigmented thick-walled intertwined hyphae and an inner layer of paler small-celled angular tissue. Conidiophores formed in a well-developed palisade lining the entire inner surface of the wall, irregular in form, hyaline to pale brown, frequently branched. Conidiogenous cells formed as terminal and lateral branchlets, 4-9 x 1.5-2 µm ± cylindrical but often tapering towards the apex, proliferating sympodially with periclinal thickening, collarettes absent or inconspicuous. Conidia 3-5.5 x 1.5-2.5 µm, bacillar, ± hyaline, aseptate, thin- and smooth-walled, without a gelatinous sheath or appendages. Teleomorph: ascostronata hysterothecia, 700-1500 (-3000) x 150-250 µm, linear, often confluent, usually in parallel series, at first narrow with a fine longitudinal fissure, later becoming broader with the black epithecium more or less exposed, with the flat stromatic top scarcely above the surface at maturity & the lateral walls poorly developed and less strongly pigmented below. Interascal tissue composed of pseudoparaphyses 1-1.5 µm diam., thin-walled below and somewhat thicker towards the apex, copiously branched & anastomosed above into a brown granular epithecium. Asci 75-95 x 11-13 µm, cylindrical to cylindric-clavate, with a short tapering stalk, thick-walled and fissitunicate, the apex rounded with a distinct ocular chamber, 8-spored. Ascospores mostly obliquely uniseriately arranged, 12.5-14 x 5.5-7 µm, clavate and strongly constricted at the ± median septum, the lower cell distinctly narrower than the upper cell, the apex rounded and the base obtuse, hyaline, thin- and smooth-walled, with granular contents, without a gelatinous sheath or appendages.