| Streblotrichum P. Beauv., 1804 |
| Streblotrichum convolutum (Hedw.) P. Beauv., 1805 |
| Streptocalypta Müll. Hal., 1879 |
| Streptocalypta santosii (E.B. Bartram) R.H. Zander, 1983 |
| Streptocalypta tortelloides (Cardot) R.H. Zander, 1983 |
| Streptopogon Wilson, 1851 |
| Streptopogon amphidiaceus (Müll. Hal.) M.T. Gallego & M.J. Cano, 2022 |
| Streptopogon bolivianus Müll. Hal., 1897 |
| Streptopogon calymperes Müll. Hal. ex Geh., 1881 |
| Streptopogon cavifolius Mitt., 1869 |
| Streptopogon erythrodontus (Taylor) Wilson, 1851 |
| Streptopogon heterophyllus Herzog, 1916 |
| Streptopogon juarezii Sharp, 1986 |
| Streptopogon matudianus H.A. Crum, 1952 |
| Streptopogon rigidus Mitt. ex Broth., 1902 |
| Streptopogon rzedowskii M.A. Cárdenas, 1986 |
| Streptopogon schenckii Müll. Hal. ex Broth., 1894 |
| Syntrichia Brid., 1801 |
| Syntrichia amphidiacea (Müll. Hal.) R.H. Zander, 1993 |
| Syntrichia anderssonii (Ångstr.) R.H. Zander, 1993 |