methylobacterium trifolii methylobacterium trifolii methylobacterium trifolii is a gram-negative, aerobic, facultatively methylotrophic and rod-shaped bacteria from the genus of methylobacterium. methylobacterium trifolii scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylobacteriaceae genus: methylobacterium species: m. thuringiense binomial name methylobacterium trifoliiwellner et al. 2013 type strain ccm 7786, lmg 25778, ta73