| Name | Microsphaera extensa Cooke & Peck |
| Authorship | Cooke & Peck |
| Rank | Species |
| Placed in | Microsphaera Léveillé |
| Contains | Microsphaera extensa var. curta U. Braun |
| Citation | 1873 [1872] Rep. (Annual) New York State Mus. Nat. Hist. 25: 95 |
| Holdings | 17 Specimens held in the Harvard University Herbaria identified as Microsphaera extensa Cooke & Peck |
| Identification made in | [no date] (4), 1982 (7), 1987 (6) |
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