| Name | Osmunda claytoniana f. mackiana Kittredge |
| Authorship | Kittredge |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Osmunda claytoniana Linnaeus |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Osmunda claytoniana f. mackiana Kittredge |
| Identification made in | [no date] (2) |
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