| [12193] Cymbopleura scabiosa | Appellations de Taxon | 12193 |
| [12194] Cyclotella scaldensis | Appellations de Taxon | 12194 |
| [12195] Cymbella subcymbiformis | Appellations de Taxon | 12195 |
| [12196] Cymbella subcistula | Appellations de Taxon | 12196 |
| [12198] Cyclotella schumannii | Appellations de Taxon | 12198 |
| [12199] Cymbella scotica | Appellations de Taxon | 12199 |
| [122] Capnioneura | Appellations de Taxon | 122 |
| [1220] Acrocladium | Appellations de Taxon | 1220 |
| [12200] Craticula angustilancea | Appellations de Taxon | 12200 |
| [12201] Cymbella rainierensis | Appellations de Taxon | 12201 |
| [12202] Campylodiscus ralfsii | Appellations de Taxon | 12202 |
| [12203] Craspedostauros amphoroides | Appellations de Taxon | 12203 |
| [12204] Cymbopleura rhomboidea var. angusta | Appellations de Taxon | 12204 |
| [12205] Craspedostauros australis | Appellations de Taxon | 12205 |
| [12206] Craspedostauros britannicus | Appellations de Taxon | 12206 |
| [12207] Cymbella reviersiana | Appellations de Taxon | 12207 |
| [12208] Craticula Frenguellii | Appellations de Taxon | 12208 |
| [12209] Craticula germainii | Appellations de Taxon | 12209 |
| [12210] Craticula guatemalensis | Appellations de Taxon | 12210 |
| [12211] Craticula halopannonica | Appellations de Taxon | 12211 |
| [12212] Cymbopleura rhomboidea var. rhomboidea | Appellations de Taxon | 12212 |
| [12213] Craticula halophila f. robusta | Appellations de Taxon | 12213 |
| [12214] Catenula robusta | Appellations de Taxon | 12214 |
| [12215] Craspedoporus rotaradiatus | Appellations de Taxon | 12215 |
| [12216] Craticula pampaeana | Appellations de Taxon | 12216 |
| [12217] Cymbopleura rupicola var. rupicola | Appellations de Taxon | 12217 |
| [12218] Craticula perrotettii | Appellations de Taxon | 12218 |
| [12219] Crateriportula inconspicuus | Appellations de Taxon | 12219 |
| [1222] Amblystegium | Appellations de Taxon | 1222 |
| [12220] Craspedodiscus undulatus | Appellations de Taxon | 12220 |
| [12221] Chamaepinnularia reinventa ssp. urtroquarea | Appellations de Taxon | 12221 |
| [12222] Cymbopleura subaequalis var. alpestris | Appellations de Taxon | 12222 |
| [12223] Cymbella subarctica | Appellations de Taxon | 12223 |
| [12224] Caloneis schumanniana f. alaskaensis | Appellations de Taxon | 12224 |
| [12225] Caloneis silicula var. alpina | Appellations de Taxon | 12225 |
| [12226] Cymbella sinuata f. antiqua | Appellations de Taxon | 12226 |
| [12227] Cymbella subhelvetica | Appellations de Taxon | 12227 |
| [12228] Craticula submolesta | Appellations de Taxon | 12228 |
| [12229] Caloneis schumanniana var. biconstricta f. minor | Appellations de Taxon | 12229 |
| [12230] Cymbopleura subapiculata | Appellations de Taxon | 12230 |
| [12231] Caloneis schroederioides | Appellations de Taxon | 12231 |
| [12232] Caloneis silicula var. elliptica | Appellations de Taxon | 12232 |
| [12233] Caloneis septentrionalis | Appellations de Taxon | 12233 |
| [12234] Cymatopleura solea var. gracilis | Appellations de Taxon | 12234 |
| [12235] Craticula subhalophila | Appellations de Taxon | 12235 |
| [12236] Cymbella schimanskii var. excelsa | Appellations de Taxon | 12236 |
| [12237] Cymbella schimanskii var. schimanskii | Appellations de Taxon | 12237 |
| [12238] Cymbella schilleri | Appellations de Taxon | 12238 |
| [12239] Cocconeis schmidtii | Appellations de Taxon | 12239 |
| [1224] Calliergon | Appellations de Taxon | 1224 |