| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Dinophyceae | Cachonina | 1 | 1 |
| Bicoecea | Cafeteria | 1 | 1 |
| Coccolithophyceae | Calcidiscus | 1 | 4 |
| Cyanophyceae | Calothrix | 5 | 13 |
| Coccolithophyceae | Calyptrosphaera | 3 | 9 |
| Trebouxiophyceae | Carolibrandtia | 1 | 3 |
| Chlorophyceae | Carteria | 10 | 29 |
| Sarcomonadea | Cavernomonas | 1 | 1 |
| Sarcomonadea | Cercomonas | 11 | 11 |
| Bacillariophyceae | Chaetoceros | 7 | 14 |
| Chlorophyceae | Chaetopeltis | 2 | 2 |
| Cyanophyceae | Chamaesiphon | 2 | 2 |
| Florideophyceae | Chantransia | 1 | 1 |
| Charophyceae | Chara | 6 | 21 |
| Chlorophyceae | Characiochloris | 2 | 3 |
| Chlorophyceae | Characium | 2 | 2 |
| Raphidophyceae | Chattonella | 2 | 45 |
| Chlorophyceae | Chlamydomonad | 1 | 1 |
| Chlorophyceae | Chlamydomonas | 30 | 92 |
| Chlorarachniophyceae | Chlorarachnion | 2 | 2 |
| Trebouxiophyceae | Chlorella | 4 | 25 |
| Chlorophyceae | Chlorococcum | 5 | 7 |
| Chlorophyceae | Chlorogonium | 4 | 25 |
| Trebouxiophyceae | Chloroidium | 1 | 2 |
| Chlorokybophyceae | Chlorokybus | 1 | 1 |
| Chlorophyceae | Chloromonas | 12 | 18 |
| Chloropicophyceae | Chloroparvula | 3 | 4 |
| Pyramimonadophyceae | Chloropicon | 3 | 7 |
| Chlorophyceae | Chlorotetraedron | 1 | 2 |
| Trebouxiophyceae | Choricystis | 3 | 8 |
| Chromerida | Chromera | 1 | 1 |
| Chlorophyceae | Chromochloris | 1 | 1 |
| Cyanophyceae | Chroococcidium | 1 | 1 |
| Stylonematophyceae | Chroodactylon | 1 | 3 |
| Cyanophyceae | Chroogloeocystis | 1 | 1 |
| Cryptophyceae | Chroomonas | 9 | 17 |
| Chrysophyceae | Chrysamoeba | 1 | 1 |
| Prymnesiophyceae | Chrysochromulina | 5 | 8 |
| Prymnesiophyceae | Chrysoculter | 1 | 1 |
| Pelagophyceae | Chrysophaeum | 1 | 2 |
| Coccolithophyceae | Chrysotila | 2 | 2 |
| Dinophyceae | Cladocopium | 1 | 1 |
| Zygnematophyceae | Closterium | 20 | 88 |
| Coccolithophyceae | Coccolithus | 1 | 2 |
| Trebouxiophyceae | Coccomyxa | 2 | 4 |
| Dinophyceae | Cochlodinium | 1 | 1 |
| Chlorophyceae | Coelastrum | 5 | 9 |
| Cyanophyceae | Coelosphaerium | 1 | 3 |
| Chlorophyceae | Colemanosphaera | 2 | 7 |
| Coleochaetophyceae | Coleochaete | 2 | 2 |
| Compsopogonophyceae | Compsopogon | 1 | 2 |
| Compsopogonophyceae | Compsopogonopsis | 1 | 1 |
| Dinophyceae | Coolia | 3 | 13 |
| Tubulinea | Copromyxa | 1 | 1 |
| Coccolithophyceae | Corisphaera | 1 | 1 |
| Rhodellophyceae | Corynoplastis | 1 | 1 |
| Zygnematophyceae | Cosmarium | 4 | 7 |
| Zygnematophyceae | Cosmocladium | 1 | 1 |
| Bacillariophyceae | Craticula | 2 | 3 |
| Trebouxiophyceae | Crucigenia | 1 | 1 |
| Chlorophyceae | Crucigeniella | 1 | 1 |
| Coccolithophyceae | Cruciplacolithus | 1 | 1 |
| Euglenophyceae | Cryptoglena | 2 | 2 |
| Cryptophyceae | Cryptomonas | 8 | 30 |
| Cyanophyceae | Cuspidothrix | 1 | 2 |
| Cyanidiophyceae | Cyanidiococcus | 1 | 1 |
| Cyanidiophyceae | Cyanidioschyzon | 1 | 6 |
| Cyanidiophyceae | Cyanidium | 1 | 3 |
| Cyanophyceae | Cyanobium | 1 | 1 |
| Glaucophyceae | Cyanophora | 4 | 4 |
| Bacillariophyceae | Cyclotella | 3 | 8 |
| Zygnematophyceae | Cylindrocystis | 3 | 6 |
| Cyanophyceae | Cylindrospermum | 2 | 2 |
| Bacillariophyceae | Cylindrotheca | 3 | 4 |
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