| Name | Erysiphe communis f. rumicis Fuckel |
| Authorship | Fuckel |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Erysiphe communis (Wallroth) Schlechtendal: Fries |
| Citation | 1863 Fasc VII: no. 681 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Erysiphe communis f. rumicis Fuckel |
| Identification made in | [no date] (2) |