The Gram reactions and cell wall topographies of six strains of , including the type strain, and four strains assigned to were studied to elucidate the taxonomic position of the two species. All strains were predominantly gram negative when stained by the Gram method but showed differences in staining between individual cells. The six strains of and one strain of exhibited a cell wall of the gram-negative type, whereas the remaining three strains of exhibited a cell wall structure typical of gram-positive microorganisms. The study thus confirms the classification of as a gram-negative bacterium but indicates that the name has been used for different groups of bacteria. Only one of the strains of investigated can legitimately be assigned to the genus , and more information is required to settle the taxonomic position of the remaining three strains.


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