Apioplagiostoma aceriferum  

Ascomata 200-400 µm diam, 150-270 µm tall; neck initially very short later reaching 300 x 50 µm, lateral, brownish, apically slightly curved and whitish to yellow. Peridium 6-8 µm thick, formed of two layers of cells. Asci 45-65 x 7.5-12.5 µm, with a large refractive apical ring to 4 µm diam, 8-spored. Ascospores 14-18 x 4.5-5 µm, septum dividing the length 4:1, tapering slightly more towards the end with the smaller cell.