| Name | Erysiphe diffusa (Cooke & Peck) U. Braun & S. Takamatsu |
| Authorship | (Cooke & Peck) U. Braun & S. Takamatsu |
| Rank | Species |
| Placed in | Erysiphe R. Hedwig ex de Candolle: Fries |
| Contains | Erysiphe diffusa var. elongata (U. Braun) U. Braun |
| Citation | 2000 Schlechtendalia 4: 7 |
| Holdings | 8 Specimens held in the Harvard University Herbaria identified as Erysiphe diffusa (Cooke & Peck) U. Braun & S. Takamatsu |
| Identification made in | [no date] (8) |
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