| Name | Erysiphe penicillata var. betulae Desmazières |
| Authorship | Desmazières |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Erysiphe penicillata (Wallroth) Link |
| Citation | 1838 Pl. Crypt. N. France Fasc. 19: no. 923 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Erysiphe penicillata var. betulae Desmazières |
| Identification made in | [no date] (2) |
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