Stroma appearing as small pustules to 450 µm diam. and 300 µm high within pale buff necrotic patches with purplish-brown margins, developing beneath or within the host epidermis, later mainly within the bark periderm, tissues pseudoparenchymatous and pale yellow to yellow-brown, composed of thin-walled closely packed cells, rarely incorporating host cells, not divided into ecto- and entostromatic regions, containing several perithicia in the lower part and with conidial locules above, without black zone lines. Anamorph: conidiomata as simple, multilocular or convoluted ostiolate locules in the upper part of the perithecial stroma, bounded by a wall of smaller darker cells, radiating from the centre. Conidiogenous cells 13-39 x 1.5 µm, holoblastic, probably determinate without percurrent proliferation. Conidia 6.5-11 x 2-3 µm, narrowly ellipsoidal to ovoid, straight to slightly curved, hyaline, aseptate. Teleomorph: ascomata perithecia, to 350 µm diam., globose with long necks to 200 x 50 µm in size that scarcely extend above the stroma surface, light brown, in compact groups, ± upright to oblique with necks near-convergent. Peridium composed of parallel to interwoven pale brown hyphae. Interascal tissue absent, neck periphysate. Asci 30-60 x 6-9 µm, clavate, apex rounded and slightly thickened, base sharply tapered to a short stalk, 8-spored. Ascospores 7-13 x 3-4.5 µm, ellipsoidal to narrowly ellipsoidal, often inequilateral or slightly curved, hyaline, thin-walled, simple, smooth.