| Name | Oidium erysiphoides f. wissadulae Ciferri |
| Authorship | Ciferri |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Oidium erysiphoides Fries: Fries |
| Citation | 1931 Cent. 2: no. 174 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Oidium erysiphoides f. wissadulae Ciferri |
| Identification made in | [no date] (2) |
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