laceyella laceyella laceyella is a gram-positive, thermophilic, spore-forming and aerobic bacterial genus from the family of thermoactinomycetaceae. the genus laceyella is namened after the english microbiologist john lacey. laceyella scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: thermoactinomycetaceae genus: laceyellayoon et al. 2005 species l. putida l. sacchari l. sediminis l. tengchongensis