roseomonas elaeocarpi roseomonas elaeocarpi roseomonas elaeocarpi is a species of gram negative, strictly aerobic, coccobacilli-shaped, pink-colored bacterium. it was first isolated from the leaf of an olive-like tree (elaeocarpus hygrophilus) in the ubon ratchathani province, thailand. the species name is derived from the genus of tree from which the species was first isolated. roseomonas elaeocarpi scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: acetobacteraceae genus: roseomonas species: r. elaeocarpi binomial name roseomonas elaeocarpidamtab 2016 the optimum growth temperature for r. elaeocarpi is 30 °c, but can grow in the 15-35 °c range. the optimum ph is 6.0, and can grow in ph 5.0-7.5.