| [16389] Navicula subdelicata var. subarctica | Appellations de Taxon | 16389 |
| [1639] Potamogeton | Appellations de Taxon | 1639 |
| [16390] Nitzschia subdenticula | Appellations de Taxon | 16390 |
| [16391] Neidium subproductum | Appellations de Taxon | 16391 |
| [16392] Navicula semidiversa | Appellations de Taxon | 16392 |
| [16393] Navicula secreta var. apiculata | Appellations de Taxon | 16393 |
| [16395] Navicula secura | Appellations de Taxon | 16395 |
| [16396] Navicula serdicensis | Appellations de Taxon | 16396 |
| [16397] Navicula silvatica f. acuta | Appellations de Taxon | 16397 |
| [16398] Navicula subinflatoides | Appellations de Taxon | 16398 |
| [16399] Nitzschia sigmaformis | Appellations de Taxon | 16399 |
| [164] Perla | Appellations de Taxon | 164 |
| [1640] Potamogeton acutifolius | Appellations de Taxon | 1640 |
| [16400] Navicula subfortis | Appellations de Taxon | 16400 |
| [16401] Navicula subgastrum | Appellations de Taxon | 16401 |
| [16402] Navicula subglabra | Appellations de Taxon | 16402 |
| [16403] Navicula supergregaria | Appellations de Taxon | 16403 |
| [16404] Navicula stygia | Appellations de Taxon | 16404 |
| [16405] Navicula subhexagona | Appellations de Taxon | 16405 |
| [16406] Navicula schadeiformis | Appellations de Taxon | 16406 |
| [16407] Navicula schroeteri var. schroeteri abnormal form | Appellations de Taxon | 16407 |
| [16408] Nanofrustulum shiloi | Appellations de Taxon | 16408 |
| [16409] Navicula subhastatula | Appellations de Taxon | 16409 |
| [1641] Potamogeton alpinus | Appellations de Taxon | 1641 |
| [16410] Navicula schmidtii | Appellations de Taxon | 16410 |
| [16411] Navicula schroeteri var. schroeteri | Appellations de Taxon | 16411 |
| [16412] Navicula subhustedtii | Appellations de Taxon | 16412 |
| [16413] Navicula siolii | Appellations de Taxon | 16413 |
| [16414] Navicula subimpressa | Appellations de Taxon | 16414 |
| [16415] Navicula scirpus | Appellations de Taxon | 16415 |
| [16416] Navicula simula | Appellations de Taxon | 16416 |
| [16417] Navicula sjoersii | Appellations de Taxon | 16417 |
| [16418] Nitzschia silicula | Appellations de Taxon | 16418 |
| [16419] Navicula specululum | Appellations de Taxon | 16419 |
| [1642] Potamogeton berchtoldii | Appellations de Taxon | 1642 |
| [16420] Navicula salinaroides | Appellations de Taxon | 16420 |
| [16421] Navicula sarolata f. capitata | Appellations de Taxon | 16421 |
| [16422] Navicula salaria | Appellations de Taxon | 16422 |
| [16423] Navicula salsa | Appellations de Taxon | 16423 |
| [16424] Navicula salva | Appellations de Taxon | 16424 |
| [16425] Neidium simplex | Appellations de Taxon | 16425 |
| [16426] Navicula(dicta) schmassmannii | Appellations de Taxon | 16426 |
| [16427] Navicula seminoides | Appellations de Taxon | 16427 |
| [16428] Navicula semiarea | Appellations de Taxon | 16428 |
| [16429] Navicula submissa | Appellations de Taxon | 16429 |
| [1643] Potamogeton coloratus | Appellations de Taxon | 1643 |
| [16430] Navicula small | Appellations de Taxon | 16430 |
| [16431] Nitzschia spinarum | Appellations de Taxon | 16431 |
| [16432] Navicula salinicola var. boliviana | Appellations de Taxon | 16432 |
| [16433] Nitzschia sigmatella | Appellations de Taxon | 16433 |