| Name | Nitzschia sigmoidea (Nitzsch) W. Smith |
| Authorship | (Nitzsch) W. Smith |
| Rank | Species |
| Placed in | Nitzschia Hassall |
| Citation | 1853 Syn. Brit. Diat. 1: 38 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Nitzschia sigmoidea (Nitzsch) W. Smith |
| Identification made in | [no date] (1) |
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