| Grimmia tolucensis Cardot, 1911 |
| Grimmia torquata Drumm., 1825 |
| Grimmia trichophylla Grev., 1824 |
| Grimmia wrightii (Sull.) Austin, 1875 |
| Grimmiaceae Arn., 1825 |
| 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 heterostichum (Hedw.) Brid., 1819 |
| Racomitrium striatipilum Cardot, 1905 |
| Racomitrium subsecundum (Hook. & Grev. ex Harv.) Mitt. & Wilson, 1857 |
| Racomitrium sudeticum (Funck) Bruch & Schimp., 1845 |
| Racomitrium trinitensis (Müll. Hal.) E. Britton & Dixon, 1922 |
| Schistidium Brid., 1818 |