| Name | Closterium gracile f. longissima Nygaard |
| Authorship | Nygaard |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Closterium gracile Brébisson ex Ralfs |
| Remarks | Created from Taxon Name Import: Closterium gracile f. longissima Nygaard |
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