| Gigartina Stackh., 1809 |
| Gigartina acicularis (Roth) J.V. Lamour., 1813 |
| Gigartina aghardhii Setch. & N.L. Gardner, 1933 |
| Gigartina armata J. Agardh, 1899 |
| Gigartina armata var. echinata (N.L. Gardner) Dawson, 1961 |
| Gigartina asperifolia J. Agardh, 1899 |
| Gigartina californica J. Agardh, 1899 |
| Gigartina canaliculata Harv., 1841 |
| Gigartina corymbifera (Kütz.) J. Agardh, 1876 |
| Gigartina eatoniana J. Agardh, 1899 |
| Gigartina elegans Grev., 1833 |
| Gigartina exasperata Harv. & Bailey, 1851 |
| Gigartina harveyana (Kütz.) Setch. & N.L. Gardner, 1933 |
| Gigartina intermedia Suringar, 1867 |
| Gigartina isiformis (C. Agardh) Grev., 1830 |
| Gigartina johnstonii E.Y. Dawson, 1944 |
| Gigartina leptorhynchos J. Agardh, 1885 |
| Gigartina lineare (Setch. & N.L. Gardner) D.H. Kim, 1976 |
| Gigartina macdougalii E.Y. Dawson, 1944 |
| Gigartina multidichotoma E.Y. Dawson, 1961 |