| Name | Osmunda cinnamomea f. frondosa Torrey & A. Gray |
| Authorship | Torrey & A. Gray |
| Rank | Forma |
| Placed in | Osmunda cinnamomea Linnaeus |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Osmunda cinnamomea f. frondosa Torrey & A. Gray |
| Identification made in | [no date] (2) |
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