| Mormolyca lineolata Fenzl, 1850 |
| Mormolyca ringens (Lindl.) Schltr., 1914 |
| Mormolyca sotoana (Carnevali & Gómez-Juárez) M.A. Blanco, 2007 |
| Muscarella Luer, 2006 |
| Muscarella fimbriata (Ames & C. Schweinf.) Luer, 2006 |
| Muscarella hastata (Ames) Karremans, 2016 |
| Muscarella marginata (Rich.) Luer, 2006 |
| Muscarella samacensis (Ames) Luer, 2006 |
| Muscarella segregatifolia (Ames & C. Schweinf.) Karremans, 2016 |
| Myoxanthus Poepp. & Endl., 1836 |
| Myoxanthus colothrix (Luer) Luer, 1982 |
| Myoxanthus congestus (A. Rich. & Galeotti) Soto Arenas, 2008 |
| Myoxanthus octomeriae (Schltr.) Luer, 1982 |
| Myoxanthus octomerioides (Lindl.) Luer, 1982 |
| Myrmecophila Rolfe, 1917 |
| Myrmecophila brysiana (Lem.) G.C. Kenn., 1979 |
| Myrmecophila christinae Carnevali & Gómez-Juárez, 2001 |
| Myrmecophila christinae var. christinae Carnevali & Gómez-Juárez, 2001 |
| Myrmecophila christinae var. ibarrae Carnevali & Tapia-Muñoz, 2001 |
| Myrmecophila exaltata (Kraenzl.) G.C. Kenn., 1979 |