methylobacterium cerastii methylobacterium cerastii methylobacterium cerastii is a gram-negative and non-spore-forming bacteria from the genus of methylobacterium which has been isolated from the surface of a leaf from the plant cerastium holosteoides in thüringen in germany. methylobacterium cerastii scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylobacteriaceae genus: methylobacterium species: m. cerastii binomial name methylobacterium cerastiiwellner et al. 2012 type strain c15 , ccm 7788, ccug 60040, dsm 23679, lmg 28249, ncimb 14837, willems r-52867