Ten obligately alkaliphilic, extremely halotolerant isolates were studied and compared with strain WN13 (T = type strain), an earlier isolate provided by H. G. Trüper. All of these strains produced round, terminally located spores in swollen sporangia. DNA-DNA hybridization values (78 to 91%) and phenotypic similarity analyses revealed that 10 of the 11 strains formed a relatively homogeneous group, and although one strain (strain AH/6/1) could not be distinguished phenotypically, it exhibited hybridization values of only 46 to 47%. This group of strains is sufficiently different from all previously validly described species in its morphological, physiological, and biochemical properties that a separate species is considered appropriate, for which the name sp. nov. is proposed.


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