| Name | Oidium ambrosiae Thümen |
| Authorship | Thümen |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Oidium |
| Citation | 1877 Mycoth. Univ. Cent. 9: no. 872 |
| Citation | 1877 Mycoth. Univ. Cent. 9: no. 872 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Oidium ambrosiae Thümen |
| Identification made in | [no date] (3) |
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