| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Citromicrobium | 1 | 1 | HMP |
| Clavibacter | 1 | 1 | HMP |
| Cloacibacillus | 2 | 2 | MGYG |
| Clostridioides | 1 | 13 | HMP/MGYG |
| Clostridium | 36 | 57 | HMP/MGYG |
| Coleofasciculus | 1 | 1 | HMP |
| Collinsella | 9 | 57 | HMP/MGYG |
| Colwellia | 1 | 1 | HMP |
| Comamonas | 2 | 3 | HMP/MGYG |
| Companilactobacillus | 1 | 1 | MGYG |