| [15887] Nitzschia macilenta | Appellations de Taxon | 15887 |
| [15888] Navicula mucronula | Appellations de Taxon | 15888 |
| [15889] Navicula menisculus var. inconspicua | Appellations de Taxon | 15889 |
| [1589] Hydrocharis | Appellations de Taxon | 1589 |
| [15890] Navicula mutica f. densestriata | Appellations de Taxon | 15890 |
| [15891] Nitzschia mediocris | Appellations de Taxon | 15891 |
| [15892] Navicula margino-nodularis | Appellations de Taxon | 15892 |
| [15893] Navicula mediopartita | Appellations de Taxon | 15893 |
| [15894] Navicula medioincrassata | Appellations de Taxon | 15894 |
| [15895] Nitzschia mediterranea | Appellations de Taxon | 15895 |
| [15896] Navicula madumensis | Appellations de Taxon | 15896 |
| [15897] Navicula megapolitana | Appellations de Taxon | 15897 |
| [15898] Navicula megastauros | Appellations de Taxon | 15898 |
| [15899] Navicula marginestriata | Appellations de Taxon | 15899 |
| [159] Marthamea | Appellations de Taxon | 159 |
| [1590] Hydrocharis morsus-ranae | Appellations de Taxon | 1590 |
| [15900] Nitzschia manguini | Appellations de Taxon | 15900 |
| [15901] Navicula minthe | Appellations de Taxon | 15901 |
| [15902] Navicula monilifera var. heterosticta | Appellations de Taxon | 15902 |
| [15903] Navicula mica | Appellations de Taxon | 15903 |
| [15904] Navicula melovskii | Appellations de Taxon | 15904 |
| [15905] Navicula minuscula f. linearis | Appellations de Taxon | 15905 |
| [15906] Navicula multiplex | Appellations de Taxon | 15906 |
| [15907] Navicula mollissima | Appellations de Taxon | 15907 |
| [15908] Navicula malutiana | Appellations de Taxon | 15908 |
| [15909] Navicula menaiana | Appellations de Taxon | 15909 |
| [1591] Lagarosiphon | Appellations de Taxon | 1591 |
| [15910] Navicula melanesica morphotype minor | Appellations de Taxon | 15910 |
| [15911] Navicula moerckii | Appellations de Taxon | 15911 |
| [15912] Navicula moskalii | Appellations de Taxon | 15912 |
| [15913] Navicula monodon | Appellations de Taxon | 15913 |
| [15914] Navicula moorosiana | Appellations de Taxon | 15914 |
| [15915] Navicula maculata var. orbiculata | Appellations de Taxon | 15915 |
| [15916] Navicula moscarensis | Appellations de Taxon | 15916 |
| [15917] Navicula mariagracielae | Appellations de Taxon | 15917 |
| [15918] Navicula mutica var. rhomboidea | Appellations de Taxon | 15918 |
| [15919] Navicula marlieri | Appellations de Taxon | 15919 |
| [1592] Lagarosiphon major | Appellations de Taxon | 1592 |
| [15920] Nitzschia macaronesica | Appellations de Taxon | 15920 |
| [15921] Navicula meridiepacifica | Appellations de Taxon | 15921 |
| [15922] Navicula mersa | Appellations de Taxon | 15922 |
| [15923] Navicula mossbergensis | Appellations de Taxon | 15923 |
| [15924] Navicula multiseriata | Appellations de Taxon | 15924 |
| [15925] Navicula maidanae | Appellations de Taxon | 15925 |
| [15926] Navicula milthersii | Appellations de Taxon | 15926 |
| [15927] Navicula mimicans | Appellations de Taxon | 15927 |
| [15928] Neidium miopsa | Appellations de Taxon | 15928 |
| [15929] Navicula mira | Appellations de Taxon | 15929 |
| [1593] Nymphoides | Appellations de Taxon | 1593 |
| [15930] Navicula minnewaukonensis | Appellations de Taxon | 15930 |