tumebacillus luteolus tumebacillus luteolus tumebacillus luteolus is a species of gram positive, aerobic, bacterium. the cells are rod-shaped, non-motile, and form spores. it was first isolated from soil in ukraine. the species was first described in 2015, and the name is derived from latin luteolus (yellowish), referring to the colony color on r2a agar. tumebacillus luteolus scientific classification domain: bacteria division: bacillota class: bacilli order: bacillales family: alicyclobacillaceae genus: tumebacillus species: t. luteolus binomial name tumebacillus luteolusher et al. 2015 the optimum growth temperature for t. luteolus is 28-37 °c, and can grow in the 25-42 °c range. its optimum ph is 6.0-9.0, and grows in ph range 5.0-9.0. the bacterium forms yellow colonies on nutrient agar.