clostridium cellulosi clostridium cellulosi clostridium cellulosi is a gram-negative and cellulolytic bacterium from the genus clostridium. clostridium cellulosi scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: clostridiaceae genus: clostridium species: c. cellulosi binomial name clostridium cellulosihe et al. 1991 type strain as 1.1777