| Polysiphonia ferulacea Suhr & J. Agardh, 1863 |
| Polysiphonia flaccidissima Hollenberg, 1942 |
| Polysiphonia foetidissima Cocks, 1892 |
| Polysiphonia forfex Harv., 1859 |
| Polysiphonia fracta Harv., 1853 |
| Polysiphonia gorgoniae Harv., 1853 |
| Polysiphonia guadalupensis Setch. & N.L. Gardner, 1930 |
| Polysiphonia hancockii E.Y. Dawson, 1944 |
| Polysiphonia hapalacantha Harv., 1853 |
| Polysiphonia havanensis Mont., 1837 |
| Polysiphonia havanensis var. mucosa J. Agardh, 1863 |
| Polysiphonia hendryi N.L. Gardner, 1927 |
| Polysiphonia hendryi var. compacta (Hollenberg) Hollenberg, 1961 |
| Polysiphonia hendryi var. gardneri (Kylin) Hollenberg, 1961 |
| Polysiphonia hollenbergii J.N. Norris, 2014 |
| Polysiphonia homoia Setch. & N.L. Gardner, 1930 |
| Polysiphonia howei Hollenberg, 1945 |
| Polysiphonia japonica Harv., 1857 |
| Polysiphonia japonica var. savatieri (Har.) Yoon, 1986 |
| Polysiphonia johnstonii Setch. & N.L. Gardner, 1924 |