1. Asci 8-spored	R. decipiens
1. Asci 16 to 128-spored	2
2. Asci 128-spored; upper and lower cells each shorter than 20 µm; absence of cauda and gelatinous appendages	R. cochleariformis
2. Asci 16-, 32- or 64-spored; upper and lower cells each longer than 20 µm; fibrillate upper cauda and gelatinous appendages in the lower cell	3
3. Asci 16 or 32 spored; upper cell 23–34 × 14–19 µm	R. myriospora
3. Asci 64 spored; upper cell 25–37 × 18–23 µm	R. pleiospora