microbacterium ulmi microbacterium ulmi microbacterium ulmi is a gram-positive, aerobic, xylanolytic, rod-shaped and non-motile bacterium from the genus microbacterium which has been isolated from sawdust from the tree ulmus nigra in salamanca in spain. microbacterium ulmi scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: microbacteriaceae genus: microbacterium species: m. ulmi binomial name microbacterium ulmirivas et al. 2004 type strain cect 5976cip 108339dsm 16931iam 15295jcm 14282lmg 20991xil02 synonyms xylanomicrobium cellulosilyticum