” Leifson and Hugh 1954 was not included in the Approved Lists of Bacterial Names and hence has no standing in bacteriological nomenclature. However, DSM 30026 (“” Leifson and Hugh 1954, type strain) has a DNA base composition of 69.1 ± 0.3 mol% G + C, whereas DSM 30030 (type strain) and DSM 30033 (“,” type strain) have 57.6 ± 0.5 and 55.3 ± 0.8 mol% G+C, respectively. DNA hybridization revealed homologies of 27% between DSM 30026 and strain DSM 30030, 26% between DSM 30026 and strain DSM 30033, but 71% between strains DSM 30030 and DSM 30033. A yellow fluorescent pigment in King medium B was produced by strains DSM 30030 and DSM 30033 but not by strain DSM 30026. Only DSM 30026 was able to grow with nitrate or nitrite as sole source of nitrogen and to reduce nitrate to nitrite and gas. All three strains reduced nitrite to gas, but an additional nitrogen source, e.g., ammonium ion, was necessary for the growth of strains DSM 30030 and DSM 30033. In mineral media, the nitrate reduction to nitrite and gas has been shown to be reproducible. Based on the differences among DSM 30026 and both DSM 30030 and DSM 30033, the revival of the name is herein proposed.


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