Hypocopra brefeldii  

Stromata no more than a clypeus surrounding the neck of individual ascomata, 250–350 µm diam., smooth, the surface black, surrounded by a narrow yellowish band of non-melanized cells, the internal tissue of the clypeus composed of pale yellow angular cells 5–8 µm diam.
Anamorph: not known.
Teleomorph: ascomata perithecial, 600–750 µm diam. and 700–800 µm tall, immersed in the substratum, globose, the neck papillate, 100–120 µm tall, not or hardly protruding beyond the surface of the clypeus. Peridium composed of an outer layer of mid brown thin-walled branched intertwined hyphae 3–5 µm diam., and an inner layer of angular pale yellowish brown cells 6–10 µm diam. Interascal tissue composed of numerous thin-walled paraphyses, 5–6 µm diam. at the base and gradually tapering towards the apex, longer than the asci. Asci 210–260 × 27–28 (–31) µm, ± cylindrical but the apical part sometimes somewhat attenuated, rather short-stalked, quite thin-walled, the apex obtuse, with a large complex ± cylindrical apical ring structure to 7 µm diam. and 8·5 µm tall that stains blue in Melzer’s reagent, 8-spored. Ascospores arranged obliquely uniseriately, (22–) 23·5–27·5 (–29) × 13–14·5 (–15) µm, ellipsoidal, not inaequilateral, aseptate, dark chocolate brown, thick-walled, with a straight gem slit 14–16·5 µm in length and a pale epispore, sometimes with a minute hyaline secondary cell, surrounded by a broad gelatinous sheath to 4 µm thick in the mid portion of the spore and sometimes extending to ca 11 µm at the apices.

Description adapted from Minter & Cannon (2020).