methylobacterium nodulans methylobacterium nodulans methylobacterium nodulans is an aerobic, facultatively methylotrophic, legume root nodule-forming and nitrogen-fixing bacteria. methylobacterium nodulans scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylobacteriaceae genus: methylobacterium binomial name methylobacterium nodulansjourand et al. 2004