| Sargassum macdougalii E.Y. Dawson, 1944 |
| Sargassum marchantae Setch. & N.L. Gardner, 1924 |
| Sargassum miyabei Yendo, 1907 |
| Sargassum montagnei Bailey & Harv., 1852 |
| Sargassum muticum (Yendo) Fensholt, 1955 |
| Sargassum natans (L.) Gaillon, 1828 |
| Sargassum pacificum Bory, 1828 |
| Sargassum pacificum var. megaphyllum W.R. Taylor, 1945 |
| Sargassum pacificum var. pacificum Bory, 1828 |
| Sargassum palmeri Grunow, 1915 |
| Sargassum platycarpum Mont., 1842 |
| Sargassum polyacanthum (Kütz.) Endl., 1843 |
| Sargassum polyacanthum f. americanum Setch. & N.L. Gardner, 1924 |
| Sargassum polyceratium Mont., 1837 |
| Sargassum polyceratium subsp. polyceratium Montagne, 1837 |
| Sargassum polyceratium var. ovatum (Collins) W.R. Taylor, 1928 |
| Sargassum pteropleuron Grunow, 1867 |
| Sargassum pusillum W.R. Taylor, 1975 |
| Sargassum ramifolium Kütz., 1843 |
| Sargassum rigidulum Kütz., 1849 |