| Solosympodiella Matsush., 1971 |
| Solosympodiella clavata Matsush., 1971 |
| Spegazzinia Sacc., 1879 |
| Spegazzinia deightonii (S. Hughes) Subram., 1956 |
| Spegazzinia tessarthra (Berk. & M. A. Curtis) Sacc., 1886 |
| Speiropsis Tubaki, 1958 |
| Speiropsis belauensis Matsush., 1985 |
| Speiropsis hyalospora Subram. & Lodha, 1964 |
| Speiropsis scopiformis Kuthub. & Nawawi, 1987 |
| Speiropsis simplex Matsush., 1971 |
| Sphaerodinium Woloszynska, 1916 |
| Sphaerodinium cinctum (Ehrenb.) Woloszynska, 1917 |
| Sphaerodinium polonicum Wooszynska, 1916 |
| Sporidesmiopsis Subram. & Bhat, 1989 |
| Sporidesmiopsis dennisii (J. L. Crane & Dumont) Bhat, W. B. Kendr. & NagRaj, 1993 |
| Sporidesmium Link, 1809 |
| Sporidesmium adscendens Berk., 1840 |
| Sporidesmium altum (Preuss) M. B. Ellis, 1958 |
| Sporidesmium atrum Link, 1809 |
| Sporidesmium australiense M. B. Ellis, 1976 |