As a continuation of an ongoing study of DNA relatedness among red-spored streptomycetes, the homology between the four species comprising the phenotypic cluster ( and ) and the four species comprising the phenotypic cluster ( and ) was measured spectrophotometrically from Ct determinations. All strains were also compared to 12 strains representing previously determined DNA-relatedness clusters in the phenotypic cluster, including the type strain NRRL B-1230. The strains segregated into 15 cluster groups at DNA relatedness >80%, including 10 single-membered clusters. and were synonymous, as were and exhibited species-level homology with strain NRRL B-2402, which had been received as exhibited significant DNA relatedness to None of the strains from the or clusters exhibited significant homology to the type strain of


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