Ascomata perithecia, ca 0.5 mm diam, necks to 0.5 mm, black-brown with a trace of brown surface hyphae, arranged in small, lax, circular to oval groups of ca 6-12, lying laterally beneath bark, the necks converging, and hardly protruding. Peridium composed of outer rounded-angular cells with thick brown walls that merge with inner compressed-elongate thin-walled hyaline cells, neck cells compressed-elongate with brown walls. Interascal tissue lining the entire inner surface of the perithecial cavity, paraphysis-like ascogenous hyphae hyaline and tapering. Asci 45-55 x (4-)5-7 µm, clavate stipitate, tapering sharply towards the base in dislodged asci, thin-walled, J-, the apex rounded to truncate with a shallow apical ring, 8-spored. Ascospores 6.5-8 x 1.5-2 µm, strongly curved, usually appearing bent or shaped like a boomerang, mostly 1-septate.