Teleomorph: stromata absent. Ascomata perithecia, 250-400 µm diam., ± globose, strongly papillate, some solitary but mostly in clusters of up to 20, initially immersed in the upper layers of bark but becoming almost superficial as the surrounding tissues decay. Ascomatal wall composed of 3-4 layers of dark brown thick-walled flattened angular cells, with simple Munk pores ca 0.5 µm diam. penetrating the cell walls, the outer layer more strongly pigmented and with thick-walled hyphae 3-4 µm in diam,, some with capitate ends, extending into the cavity between bark and wood. Interascal tissue of simple paraphyses 2.5-4 µm diam., rather sparse, very thin-walled, septate, apparently unbranched, the apices obtuse. Asci 65-80 x 6-7.5 µm, cylindrical, rather short-stalked (usually between 10 and 20 µm), thin-walled and not fissitunicate, the apex obtuse, with a rather inconspicuous apical ring that does not blue in iodine, 8-spored. Ascospores arranged ± uniseriately, ellipsoidal, 7.2-9.5 (-10.5) x 3.8-4.5 (-5.2) µm, with a conspicuous transverse septum 60-70% of the distance between apices (the shorter cell may be basal or apical), dark brown, fairly thick-walled, smooth, lacking germ pores, without a gelatinous sheath or appendages. In a proportion of asci, the ascospore development is disrupted resulting in aseptate spores or large and irregular structures that are presumably multinucleate.