brachybacterium sacelli brachybacterium sacelli brachybacterium sacelli is a species of gram positive, strictly aerobic, cream-pigmented bacterium. the cells are coccoid during the stationary phase, and irregular rods during the exponential phase. it was first isolated from a medieval wall painting of the chapel of schloss herberstein in styria, austria. the species was proposed in 2014, and the name is derived from latin sacelli (of the chapel). another novel species b. fresconis was isolated from the same painting. brachybacterium sacelli scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: micrococcales family: dermabacteraceae genus: brachybacterium species: b. sacelli binomial name brachybacterium sacelliheyrman et al. 2002 the optimum growth temperature for b. sacelli is 20-30 °c, but can grow in the 5-40 °c range.