clostridium arbusti clostridium arbusti clostridium arbusti is an obligately anaerobic, gram-positive and spore-forming bacterium from the genus clostridium which has been isolated from pear orchard soil from daejeon in korea. clostridium arbusti scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: clostridiaceae genus: clostridium species: c. arbusti binomial name clostridium arbustijung et al. 2010 type strain dsm 23575, jcm 14858, kctc 5449, sl206