| Name | Sargassum johnstonii f. laxius Setchell & N. L. Gardner |
| Authorship | Setchell & N. L. Gardner |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Sargassum johnstonii Setchell & N. L. Gardner |
| Remarks | Created from Taxon Name Import: Sargassum johnstonii f. laxius Setchell & Gardner |
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