| Sargassum fuliginosum Kütz., 1849 |
| Sargassum fuliginosum var. californicum Grunow, 1916 |
| Sargassum furcatum Kütz., 1843 |
| Sargassum guardiense Setch. & N.L. Gardner, 1924 |
| Sargassum herporhizum Setch. & N.L. Gardner, 1924 |
| Sargassum horneri (Turner) C. Agardh, 1820 |
| Sargassum horridum Setch. & N.L. Gardner, 1924 |
| Sargassum howellii Setch., 1937 |
| Sargassum hystrix J. Agardh, 1847 |
| Sargassum hystrix var. buxifolium Chauvin, 1848 |
| Sargassum hystrix var. subcristatum Grunow, 1915 |
| Sargassum insulare Setch. & N.L. Gardner, 1924 |
| Sargassum johnstonii Setch. & N.L. Gardner, 1924 |
| Sargassum johnstonii f. gracile Setch. & N.L. Gardner, 1924 |
| Sargassum johnstonii f. johnstonii Setch. & N.L. Gardner, 1924 |
| Sargassum johnstonii f. laxius Setch. & N.L. Gardner, 1924 |
| Sargassum kjellmanianum Yendo, 1907 |
| Sargassum kjellmanianum f. muticum Yendo, 1907 |
| Sargassum lapazeanum Setch. & N.L. Gardner, 1924 |
| Sargassum liebmannii J. Agardh, 1847 |