streptomyces nigrescens streptomyces nigrescens streptomyces nigrescens is a bacterium species from the genus of streptomyces which has been isolated from soil. streptomyces nigrescens produces 5-alkyl-1,2,3,4-tetrahydroquinolines and the antibiotics phoslactomycin a - f. streptomyces nigrescens scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: streptomycetales family: streptomycetaceae genus: streptomyces species: s. nigrescens binomial name streptomyces nigrescenspridham et al. 1958 type strain 1800/54, as 4.1410, atcc 23941, bcrc 15127, cbs 103.61, cbs 925.68, ccrc 15127, cgmcc 4.1410, dsm 40276, eth 28443, ifo 12894, ina 1800/54, isp 5276, jcm 4401, kcc s-0401, kccs-0401, lanoot r-8696, lmg 19332, nbrc 12894, ncib 9856, ncimb 9856, nrrl b-12176, nrrl-isp 5276, r-8696, ria 1194, vkm ac-1705 synonyms streptomyces ruanii, actinomyces nigrescens