Colonies: on pale brittle areas of dead twigs attached to living trees, rarely on cone scales. Zone lines not present. Anamorph: not known. Teleomorph: ascomata 0.7-3 x 0.4-1.5 mm, sometimes curved or with irregular branching, with a poorly-defined edge and usually only the lips and dull blackened upper wall immediately next to the split being visible, well-defined on cone-scales with the entire outer surface melanized, opening by a single longitudinal or irregular split revealing the greyish hymenium. Outer wall composed of angular cells 5-7 µm diam. with blackened walls, near the split becoming elongate, lower wall located above remaining and not markedly tanned bark cells, composed of angular cells 5-7 µm. diam with walls less blackened than those of the upper wall. Subhymenium composed of thin-walled colourless intertwined hyphae. Interascal tissue of filiform. paraphyses ca 1 µm diam., branching not observed, clearly longer than the asci, with flexuous hooked tips, gel not observed. Asci 80-120 x 8-10 µm, elongate clavate, thin-walled and not fissitunicate, with an obtuse to rounded apex, not turning blue in iodine, opening with a small apical split, 8-spored. Ascospores fasciculate, 26-42 x 1.5-2 µm, rod-shaped to filiform, colourless, aseptate, thin-walled, smooth, sometimes enveloped in a mucous sheath about 0.5 µm thick while still within the ascus, the sheath not observed outside the ascus.