| Polysiphonia johnstonii var. concinna (Hollenberg) Hollenberg, 1961 |
| Polysiphonia macrocarpa Harv., 1836 |
| Polysiphonia marchantae Setch. & N.L. Gardner, 1924 |
| Polysiphonia masonii Setch. & N.L. Gardner, 1930 |
| Polysiphonia mollis J.D. Hooker & Harvey, 1847 |
| Polysiphonia nathanielii Hollenberg, 1958 |
| Polysiphonia opaca (C. Agardh) Moris & De Not., 1839 |
| Polysiphonia pacifica Hollenberg, 1942 |
| Polysiphonia pacifica var. delicatula Hollenberg, 1942 |
| Polysiphonia pacifica var. gracilis Hollenberg, 1942 |
| Polysiphonia paniculata Mont., 1842 |
| Polysiphonia perpusilla J. Agardh, 1847 |
| Polysiphonia pseudovillum Hollenberg, 1968 |
| Polysiphonia ramentacea Harv., 1853 |
| Polysiphonia saccorhiza (Collins & Herv.) Hollenberg, 1968 |
| Polysiphonia savatieri Har., 1891 |
| Polysiphonia schneideri B. Stuercke & D.W. Freshwater, 2010 |
| Polysiphonia scopulorum Harv., 1855 |
| Polysiphonia scopulorum var. villum (J. Agardh) Hollenberg, 1968 |
| Polysiphonia sertularioides (Gratel.) J. Agardh, 1863 |