| Order | Family | Genus | Species |
|---|---|---|---|
| Ascoseirales | 0 | 1 | 1 |
| Asterocladales | 1 | 1 | 5 |
| Cutleriales | 1 | 4 | 13 |
| Desmarestiales | 2 | 4 | 38 |
| Dictyotales | 2 | 21 | 637 |
| Ectocarpales | 7 | 106 | 709 |
| Fucales | 7 | 47 | 389 |
| Laminariales | 8 | 34 | 192 |
| Onslowiales | 1 | 2 | 5 |
| Ralfsiales | 6 | 15 | 84 |
| Scytothamnales | 0 | 3 | 6 |
| Sphacelariales | 6 | 12 | 76 |
| Sporochnales | 1 | 9 | 30 |
| Syringodermatales | 1 | 1 | 1 |
| Tilopteridales | 2 | 5 | 12 |