TRANSFER OF STREPTOSPORANGIUM-VIRIDOGRISEUM (OKUDA ET-AL 1966), STREPTOSPORANGIUM-VIRIDOGRISEUM SUBSP KOFUENSE (NONOMURA AND OHARA 1969), AND STREPTOSPORANGIUM-ALBIDUM (FURUMAI ET-AL 1968) TO KUTZNERIA GEN-NOVAS KUTZNERIA-VIRIDOGRISEA COMB-NOV, KUTZNERIA-KOFUENSIS COMB-NOV, ANDKUTZNERIA-ALBIDA COMB-NOV, RESPECTIVELY, AND EMENDATION OF THE GENUS STREPTOSPORANGIUM

A chemotaxonomic analysis of 14 Streptosporangium species revealed the phenotypic heterogeneity of this genus. The type species, Streptospor angium roseum, and 11 other species share similar isoprenoid quinones, fatty acids, and polar lipids. Two species, Streptosporangium albidum and Streptosporangium viridogriseum, including S. viridogriseum subsp . viridogriseum and S. viridogriseum subsp. kofuense, were characteriz ed by a pattern of chemotaxonomic properties that was clearly distinct from the pattern obtained for the authentic Streptosporangium species . The results of a previous phylogenetic analysis of 16S ribosomal DNA and 5S rRNA indicated that the type species and its relatives are dis tantly related to members of the- genus Streptomyces, whereas a member of the other group was found to be phylogenitically related to, but c learly distinct from, members of the family Pseudonocardiaceae. On the basis of these phenotypic and genomic differences, we propose the nam e Kutzneria gen. nov, for a new genus containing the previously miscla ssified Streptosporangium species and describe Kutzneria viridogrisea comb. nov., Kutzneria albida comb. nov., and Kutzneria kofuensis comb. nov. The type species of the new genus is Kutzneria viridogrisea, and the type strain is DSM 43850 (= ATCC 25242).