bacillus horti bacillus horti bacillus horti is a species of gram-negative alkaliphilic bacillus. its cells are strictly aerobic rods that produce subterminally located ellipsoidal spores. its type strain is k13t (= jcm 9943t). bacillus horti scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: bacillus species: b. horti binomial name bacillus hortiyumoto et al. 1998