| [16250] Navicula quodest | Appellations de Taxon | 16250 |
| [16251] Navicula ranomafanensis | Appellations de Taxon | 16251 |
| [16252] Navicula rapsonii | Appellations de Taxon | 16252 |
| [16253] Navicula rautenbachiae | Appellations de Taxon | 16253 |
| [16254] Navicula ravinae | Appellations de Taxon | 16254 |
| [16255] Nitzschia rhombiformis | Appellations de Taxon | 16255 |
| [16256] Nitzschia robusta | Appellations de Taxon | 16256 |
| [16257] Nitzschia rectirobusta | Appellations de Taxon | 16257 |
| [16258] Navicula rostellata var. biwaensis | Appellations de Taxon | 16258 |
| [16259] Navicula radiosaeformis | Appellations de Taxon | 16259 |
| [1626] Lemna minor | Appellations de Taxon | 1626 |
| [16260] Navicula radiosiola | Appellations de Taxon | 16260 |
| [16261] Navicula radiopunctata | Appellations de Taxon | 16261 |
| [16262] Navicula radiostriata | Appellations de Taxon | 16262 |
| [16263] Navicula radiata | Appellations de Taxon | 16263 |
| [16264] Navicula radiosa var. dubravicensis | Appellations de Taxon | 16264 |
| [16265] Nitzschia rectiformis | Appellations de Taxon | 16265 |
| [16266] Navicula retusa var. gregorii | Appellations de Taxon | 16266 |
| [16267] Navicula regelli | Appellations de Taxon | 16267 |
| [16268] Navicula rogersii | Appellations de Taxon | 16268 |
| [16269] Navicula regata | Appellations de Taxon | 16269 |
| [16270] Navicula rhynchocephala var. brevis | Appellations de Taxon | 16270 |
| [16271] Navicula perventralis | Appellations de Taxon | 16271 |
| [16272] Navicula praetexta var. abundans | Appellations de Taxon | 16272 |
| [16273] Nitzschia pseudoamphioxys | Appellations de Taxon | 16273 |
| [16274] Navicula pyrenaica | Appellations de Taxon | 16274 |
| [16275] Navicula quechua | Appellations de Taxon | 16275 |
| [16276] Navicula quasidisjuncta | Appellations de Taxon | 16276 |
| [16277] Neidium quadriundulatum | Appellations de Taxon | 16277 |
| [16278] Navicula quadrimaculata | Appellations de Taxon | 16278 |
| [16279] Navicula radiosa var. acuta | Appellations de Taxon | 16279 |
| [1628] Lemna trisulca | Appellations de Taxon | 1628 |
| [16280] Naviculadicta raederae | Appellations de Taxon | 16280 |
| [16281] Navicula rauhii | Appellations de Taxon | 16281 |
| [16282] Navicula radiosa f. intermedia | Appellations de Taxon | 16282 |
| [16283] Navicula rajmundii | Appellations de Taxon | 16283 |
| [16284] Navicula rakowskae | Appellations de Taxon | 16284 |
| [16285] Navicula ramosissima | Appellations de Taxon | 16285 |
| [16286] Navicula retrica | Appellations de Taxon | 16286 |
| [16287] Navicula reichardtiana abnormal form | Appellations de Taxon | 16287 |
| [16288] Navicula radiosa var. constricta | Appellations de Taxon | 16288 |
| [16289] Navicula rectum | Appellations de Taxon | 16289 |
| [1629] Spirodela | Appellations de Taxon | 1629 |
| [16290] Navicula radiosa var. cuneata | Appellations de Taxon | 16290 |
| [16291] Navicula recurvata | Appellations de Taxon | 16291 |
| [16292] Navicula reinhardtii var. elliptica | Appellations de Taxon | 16292 |
| [16293] Navicula regressa | Appellations de Taxon | 16293 |
| [16294] Navicula reinhardtii f. lanceolata | Appellations de Taxon | 16294 |
| [16295] Neidium reimerii | Appellations de Taxon | 16295 |
| [16296] Navicula reinhardtii f. rhomboides | Appellations de Taxon | 16296 |