| Ectocarpaceae C. Agardh, 1828 |
| Ectocarpus Lyngb., 1819 |
| Ectocarpus acutus Setch. & N.L. Gardner, 1922 |
| Ectocarpus antillarum Grunow, 1867 |
| Ectocarpus breviarticulatus J. Agardh, 1847 |
| Ectocarpus bryantii Setch. & N.L. Gardner, 1924 |
| Ectocarpus chantransioides Setch. & N.L. Gardner, 1922 |
| Ectocarpus commensalis Setch. & N.L. Gardner, 1922 |
| Ectocarpus confervoides Le Jol., 1863 |
| Ectocarpus confervoides f. dasycarpus (Kuck.) Rosenv. & S. Lund, 1941 |
| Ectocarpus confervoides f. parvus Setch. & N.L. Gardner, 1922 |
| Ectocarpus confervoides f. variabilis D.A. Saunders, 1898 |
| Ectocarpus confervoides var. pygmaeus (Aresch.) Rosenv., 1893 |
| Ectocarpus corticulatus D.A. Saunders, 1898 |
| Ectocarpus cylindricus D.A. Saunders, 1898 |
| Ectocarpus cylindricus f. codiophilus Setch. & N.L. Gardner, 1922 |
| Ectocarpus dasycarpus Kuck., 1891 |
| Ectocarpus dimorphus P.C. Silva, 1957 |
| Ectocarpus duchassaingianus Grunow, 1867 |
| Ectocarpus elachistaeformis Heydr., 1892 |