| Name | Erysiphe communis f. trifolii P. Karsten |
| Authorship | P. Karsten |
| Rank | Forma |
| Placed in | Erysiphe communis (Wallroth) Schlechtendal: Fries |
| Citation | 1866 Fungi Fenniae Exsicc. 4: 368 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Erysiphe communis f. trifolii P. Karsten |
| Identification made in | [no date] (1) |
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