| Name | Diplazium williamsii Copeland |
| Authorship | Copeland |
| Rank | Species |
| Placed in | Diplazium Swartz |
| Citation | 1906 Philipp. J. Sci. 1(Suppl. 2): 150 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Diplazium williamsii Copeland |
| Identification made in | [no date] (1) |
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