roseomonas aceris roseomonas aceris roseomonas aceris is a species of gram negative, strictly aerobic, coccobacilli-shaped, light red-colored bacteria. it was first isolated from the trunk of a mono maple tree (acer mono) in the shirakami-sanchi forest region of japan. the species was named after the acer tree genus from which it was isolated. roseomonas aceris scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: acetobacteraceae genus: roseomonas species: r. aceris binomial name roseomonas aceristonouchi 2014 the optimum growth temperature for r. aceris is 30 °c, but can grow in the 10-35 °c range. the optimum ph is 7.0, and can grow in ph 6.0-9.0.