| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Clostridium hylemonae | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium hydrogeniformans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium huakuii | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium homopropionicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium herbivorans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium haemolyticum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium guangxiense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium grantii | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium gasigenes | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium ganghwense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium fungisolvens | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium frigoris | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium frigidicarnis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium formicaceticum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium fimetarium | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium fessum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium fermenticellae | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium felsineum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium fallax | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium estertheticum subsp. laramiense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium estertheticum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium estertheticum subsp. estertheticum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium drakei | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium disporicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium cylindrosporum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium composti | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium combesii | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium collagenovorans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium colinum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium colicanis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago |