Flagellar Characteristics 



All typical strains showed polar monotrichous flagellation. 

 Atrichous strains are common and the strains which are flagellated 

 are often very poorly so. In some species the flagella are of uni- 

 form curvature while in others the curvature is very irregular. In 

 two species were found individuals with flagella of two distinctly 

 different wavelengths (Figs. 14d, j, k). The one culture of X. 

 arsenooxijdans studied was well flagellated with flagella of rather 

 long wavelength and frequently coiled (Table II). 



One culture labeled Bacterium tardicrescens was typical of 

 Xanthomvnas species except for failure to oxidize glucose. The 

 flagellar wavelength was significantly less than that of all the other 

 Xanthomonas species. In spite of these variations this organism 

 appears sufficiently typical to be classified as Xanthomonas tardi- 

 crescens comb. nov. X. rubrilineans did not oxidize glucose, was 

 nonpigmented but morphologically typical. The strain of Xantho- 

 morms heticola studied was peritrichously flagellated, nonpig- 

 mented, and oxidized glucose and sucrose. This organism could 

 be classified in the genus Agrohacterium. 



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