| Name | Homoeocladia sigmoidea W. Smith |
| Authorship | W. Smith |
| Rank | Species |
| Placed in | Homoeocladia C. Agardh |
| Citation | 1856 Syn. Brit. Diat. 2: 81, t. 54, fig. 349 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Homoeocladia sigmoidea W. Smith |
| Identification made in | [no date] (1) |
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