| Name | Erysiphe extensa (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 extensa var. curta (U. Braun) U. Braun & S. Takamatsu |
| Citation | 2000 Schlechtendalia 4: 8 |
| Holdings | 12 Specimens held in the Harvard University Herbaria identified as Erysiphe extensa (Cooke & Peck) U. Braun & S. Takamatsu |
| Identification made in | [no date] (5), 2025 (7) |
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