| Lellingeria prionodes (Mickel & Beitel) A.R. Sm. & R.C. Moran, 1991 |
| Lellingeria sacksii Sundue, 2017 |
| Leptochilus Kaulf., 1824 |
| Leptochilus cladorrhizans (Spreng.) Maxon, 1926 |
| Leptochilus hemiotis Maxon, 1925 |
| Leptochilus liebmannii Maxon, 1930 |
| Leptochilus mexicanus Christ, 1907 |
| Leptochilus pergamentaceus Maxon, 1924 |
| Leptochilus pteropus (Blume) Fraser-Jenk., 2008 |
| Leucotrichum Labiak, 2010 |
| Leucotrichum mitchelliae (Baker) Labiak, 2010 |
| Loxogramme (Blume) C. Presl, 1836 |
| Loxogramme mexicana (Fée) C. Chr., 1934 |
| Loxogramme salvinii (Hook.) Maxon, 1909 |
| Loxogrammoideae H. Schneid., 2011 |
| Marginaria Bory, 1824 |
| Marginaria karwinskyana C. Presl, 1836 |
| Melpomene A.R. Sm. & R.C. Moran, 1992 |
| Melpomene deltata (Mickel & Beitel) A.R. Sm. & R.C. Moran, 1992 |
| Melpomene firma (J. Sm.) A.R. Sm. & R.C. Moran, 1992 |