| Order | Family | Genus | Species |
|---|---|---|---|
| Acrochaetiales | 1 | 7 | 49 |
| Acrosymphytales | 3 | 3 | 12 |
| Ahnfeltiales | 1 | 1 | 11 |
| Balbianiales | 1 | 2 | 2 |
| Balliales | 1 | 1 | 10 |
| Bangiales | 1 | 17 | 385 |
| Batrachospermales | 3 | 24 | 200 |
| Bonnemaisoniales | 2 | 8 | 49 |
| Cavernulicolales | 1 | 3 | 3 |
| Ceramiales | 8 | 272 | 2191 |
| Colaconematales | 1 | 1 | 20 |
| Compsopogonales | 2 | 4 | 7 |
| Corallinales | 4 | 38 | 1292 |
| Corynodactylales | 1 | 1 | 1 |
| Cyanidiales | 2 | 3 | 73 |
| Dixoniellales | 1 | 1 | 1 |
| Entwisleiales | 1 | 1 | 1 |
| Erythropeltidales | 2 | 10 | 49 |
| Galdieriales | 1 | 1 | 60 |
| Gelidiales | 4 | 17 | 286 |
| Gigartinales | 39 | 194 | 1535 |
| Glaucosphaerales | 1 | 1 | 1 |
| Gracilariales | 2 | 11 | 284 |
| Halymeniales | 2 | 34 | 394 |
| Hapalidiales | 2 | 20 | 299 |
| Hildenbrandiales | 1 | 3 | 134 |
| Nemaliales | 4 | 30 | 271 |
| Nemastomatales | 2 | 7 | 81 |
| Ottiales | 1 | 2 | 2 |
| Palmariales | 4 | 11 | 62 |
| Peyssonneliales | 1 | 14 | 251 |
| Pihiellales | 1 | 1 | 1 |
| Plocamiales | 2 | 4 | 124 |
| Porphyridiales | 2 | 6 | 20 |
| Rhodachlyales | 1 | 1 | 4 |
| Rhodellales | 1 | 3 | 12 |
| Rhodochaetales | 1 | 1 | 2 |
| Rhodogorgonales | 1 | 3 | 11 |
| Rhodymeniales | 6 | 54 | 434 |
| Rufusiales | 1 | 1 | 1 |
| Sebdeniales | 1 | 4 | 35 |
| Sporolithales | 1 | 3 | 67 |
| Stylonematales | 1 | 10 | 27 |
| Thoreales | 1 | 2 | 25 |