mesorhizobium australicum mesorhizobium australicum mesorhizobium australicum is a gram-negative bacteria from the genus of mesorhizobium which was isolated from nodules on biserrula pelecinus in australia mesorhizobium australicum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: mesorhizobium species: m. australicum binomial name mesorhizobium australicumnandasena et al. 2009 type strain hambi 3006, lmg 24608, nandasena n14, willems r-34166, wsm2073