SUMMARY: The fine structure of and was investigated by electron microscopy of chemically fixed and freeze-etched preparations. All species were grown in Brain Heart Infusion broth and examined after 4 and 7 days of growth. The fine structure of all species was similar. The thickness of the wall differed consistently, with having the thickest. The mode of growth and division was of a uniform pattern. During growth lateral protrusions were formed, followed by two successive cell divisions which were perpendicular to each other and resulted in the formation of cell clusters. Usually these clusters consisted of two rows of cells at approximately right angles.


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