Biscogniauxia nummularia  

Stromata 0.5-2.5 (-5) mm long, 0.5-2 (-5) mm broad and 600-900 µm thick, erumpent from bark, applanate, orbicular to elliptical to irregular in outline, initially with a pale brown dehiscent surface layer, later black and very carbonaceous, applanate to convex, with finely papillate ostioles which become punctate with age. Internal tissue woody, greyish to dark brown, hardly present between the ascomata.
Anamorph: Nodulisporium-like (Periconiella-like according to Ju & Rogers, 1996).
Teleomorph: ascomata perithecia, 300-500 µm diam. and 400-700 µm tall, ovoid to globose­cylindrical. Interascal tissue of copious fairly thin-walled unbranched paraphyses. Asci cylindrical, sporing part 70-90 x 8-10 µm with stipe 20-30 µm long, apical apparatus blue in iodine, 3-4 µm diam. and 1.5-2.5 µm tall, visible as a broad disc in optical section. Ascospores arranged uniseriately, 11-13 (-15) x 6.5-8.5 µm, fusiform-ellipsoidal to broadly ellipsoidal with obtuse ends, not or hardly inaequilateral, dark brown, smooth, with a straight germ slit running the full length of the spore, without a gelatinous sheath or appendages.