Anamorph: conidiomata 200-450 x 150-250 µm, concolorous or greyish and slightly darker than the substratum, with a darker, often well-defined margin, elliptical to elongate, not or only slightly raising the substratum surface, smooth, coalescing infrequently, with or without ostioles, opening by a single longitudinal split to one side of the conidioma along a line of stomata, or between two rows of epidermal cells, ostioles when present being found in the blackened wall lining this split; subepidermal. Conidiogenous cells developing in a compact palisade from a poorly defined layer of fungal cells, 5-10 x 2-5 µm, cylindrical but tapered near the apex, proliferating sympodially. Conidia 4.5-6.5 (-8) x 0.75-1 µm, cylindrical, sometimes slightly isthmoid or with one end slightly swollen, hyaline, aseptate, thin-walled, without an epispore or gelatinous sheath. Teleomorph: ascomata immersed apothecia, 700-1200 x 450-750 µm, amphigenous on needles, usually with well-developed black zone lines separating colonies, when wet black and shining, when dry black in the centre for more than half the total ascoma surface, the remainder grey surrounded by a well-developed black line, covered by the host epidermis on either side, but above the epidermis in the centre (more than five epidermal cells visible in a group on the central part of the ascoma floor), opening by a single longitudinal split about three quarters of the length of the ascoma, the lips usually yellow to reddish brown. Interascal tissue of filiform septate paraphyses 110-160 µm long, sometimes curved and slightly swollen at the apex, usually with a conspicuous gelatinous coating. Asci 110-155 x 9.5-11.5 µm, cylindrical, short-stalked, the apex obtuse, thin-walled, without any subapical structures, 8-spored. Ascospores arranged in a fascicle, 70-110 x 1.5-2 µm, filiform, sometimes helically coiled, slightly tapered towards the base, hyaline, aseptate, thin-walled, smooth, surrounded by a gelatinous sheath 1-1.5 µm thick.