| Name | Closterium sigmoideum f. major West & G.S.West |
| Authorship | West & G. S. West |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Closterium sigmoideum Lagerheim & Nordstedt |
| Remarks | Created from Taxon Name Import: Closterium sigmoideum f. major West & G.S.West |
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