| Name | Nitzschia sigma var. curvula (Ehrenberg) Brun |
| Authorship | (Ehrenberg) Brun |
| Rank | Variety |
| Placed in | Nitzschia sigma (Kützing) W. Smith |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Nitzschia sigma var. curvula (Ehrenberg) Brun |
| Identification made in | [no date] (1) |
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