| Grimmia teretinervis Limpr., 1884 |
| Grimmia tolucensis Cardot, 1911 |
| Grimmia torquata Drumm., 1825 |
| Grimmia trichophylla Grev., 1824 |
| Grimmia trichophylloidea Schimp. ex Müll. Hal., 1897 |
| Grimmia unicruris Müll. Hal., 1882 |
| Grimmia wrightii (Sull.) Austin, 1875 |
| Grimmiaceae Arn., 1825 |
| Guembelia Hampe, 1846 |
| Guembelia donniana (Sm.) Buyss., 1883 |
| Racomitrium Brid., 1819 |
| Racomitrium austrogeorgicum Paris, 1896 |
| Racomitrium canescens (Hedw.) Brid., 1819 |
| Racomitrium crispipilum (Taylor) A. Jaeger, 1874 |
| Racomitrium crispulum (Hook. f. & Wilson) Hook. f. & Wilson, 1854 |
| Racomitrium crispulum var. crispulum (Hook. f. & Wilson) Hook. f. & Wilson, 1854 |
| Racomitrium cylindricum Schimp., 1872 |
| Racomitrium ericoides (Hedw.) Brid., 1819 |
| Racomitrium fasciculare (Hedw.) Brid., 1819 |
| Racomitrium fragile Renauld & Cardot, 1909 |