| Name | Erysiphella aggregata f. autumnalis Thümen |
| Authorship | Thümen |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Erysiphella aggregata Peck |
| Citation | 1877 Cent. 8: no. 753 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Erysiphella aggregata f. autumnalis Thümen |
| Identification made in | [no date] (2) |
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