| Species | Name Used |
|---|---|
| Sargassum muticum (Yendo) Fensholt | Sargassum muticum (p. 26 ) |
| Schizymenia pacifica (Kylin) Kylin | Schizymenia pacifica (p. 26 ) |
| Scytosiphon lomentaria (Lyngbye) Link, nom. cons. | Scytosiphon lomentaria (p. 103 ) |
| Sphacelaria subfusca Setchell & N.L. Gardner | Sphacelaria subfusca (p. 104 ) |
| Stenogramme interrupta (C. Agardh) Montagne ex Harvey | Stenogramme interrupta (p. 26 ) |
| Stylonema alsidii (Zanardini) Drew, 1956 | Goniotrichum elegans (p. 102 ) |
| Syringoderma abyssicola (Setchell & N.L. Gardner) Levring | Syringoderma abyssicola (p. 103 ) |
| Ulva intestinalis Linnaeus | Enteromorpha intestinalis (p. 25 ) |