alicyclobacillus tengchongensis alicyclobacillus tengchongensis alicyclobacillus tengchongensis is a species of gram positive, strictly aerobic, bacterium. the bacteria are acidophilic and produced endospores. it was first isolated from soil in a hot spring in tengchong, china. the species was first described in 2014, and the name refers to the city from which it was first isolated. alicyclobacillus tengchongensis scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: alicyclobacillaceae genus: alicyclobacillus species: a. tengchongensis binomial name alicyclobacillus tengchongensiskim et al. 2014 the optimum growth temperature for a. tengchongensis is 45 °c, and can grow in the 30-50 °c range. the optimum ph is 3.2, and can grow in ph 2.0-6.0.