| Name | Cystopteris fragilis var. protrusa Weatherby |
| Authorship | Weatherby |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Cystopteris fragilis (Linnaeus) Bernhardi |
| GUID | urn:lsid:ipni.org:names:75687-2 |
| Citation | 1935 Rhodora 37: 373 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cystopteris fragilis var. protrusa Weatherby |
| Identification made in | [no date] (1) |
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