Laminariaceae
Laminariaceae is a family of brown algal seaweeds, many genera of which are popularly called "kelp". The table indicates the genera within this family. The family includes the largest known seaweeds: Nereocystis and Macrocystis.
| Genus | Authority | Species |
| Arthrothamnus | Ruprecht | 2 |
| Cymathere | J. Agardh | 2 |
| Laminaria | J.V. Lamouroux | 29 |
| Macrocystis | C. Agardh | 4 |
| Nereocystis | Postels & Ruprecht | 1 |
| Pelagophycus | Areschoug | 1 |
| Postelsia | Ruprecht | 1 |
| Pseudolessonia | G.Y. Cho, N.G. Klochkova, T.N. Krupnova & Boo | 1 |
| Saccharina | Stackhouse | 24 |
| Streptophyllopsis | Kajimura | 1 |