| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Streptophyta | 5 | 456 | 0 |
| Stylococcaceae | 3 | 7 | 0 |
| Suctoria | 3 | 53 | 0 |
| Sulfonecta uniserialis | 0 | 1 | 0 |
| Surirella elegans Ehrenberg | 0 | 5 | 0 |
| Surirella linearis | 0 | 1 | 0 |
| Surirellaceae | 3 | 8 | 0 |
| Surirellales | 1 | 8 | 0 |
| Synchaeta | 0 | 9 | 0 |
| Synchaeta pectinata Ehrenberg 1832 | 0 | 4 | 0 |
| Synchaetidae | 4 | 15 | 0 |
| Syndermata | 1 | 95 | 0 |
| Synechoccales | 1 | 0 | 0 |
| Synechococcales | 1 | 8 | 0 |
| Synura sphagnicola | 0 | 3 | 0 |
