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.
The optimum growth temperature for R. aceris is 30 ðC, but can grow in the 10-35 ðC range. The optimum pH is 7.0, and can grow in pH 6.0-9.0.