52. ChromatiuTn 



One culture of Chromatium strain D was received from Dr. 

 D. D, Hendley of the University of Chicago (Fig. 59). The orig- 

 inal broth culture was very motile and was stained directly with- 

 out subculture. The growth had a distinct red color and the 

 massed bacteria were red. 



Flagellar Characteristics 



Flagellation was excellent and the individual bacteria showed 

 long polar monotrichous flagella. The flagella were very uniform 

 in shape with an average wavelength of 2.05 microns and ampli- 

 tude of 0.47 micron. 



5 3 . Khodopseudomonas 



The Bergey's Manual lists four species of Khodopseudomonas. 

 Three of these species were obtained for study: Rhodopseudo- 

 monos palustris ATH 2.1.1 from Hopkins Marine Station; R. palus- 

 tris, NCIB 8252; Rhodopseudonwiuis gelatinosa, NCIB 8290; and 

 Rhodopseiidomonas spheroides, NCIB 8253, from the National 

 Collection of Industrial Bacteria in England. All the cultures grew 

 readily on agar slants producing a reddish growth, and all were 

 motile. No attempt at species identification was made. 



Flagellar Characteristics 



The flagellation of the four cultures was monotrichous. In R. 

 gelatinosa, NCIB 8290, the flagellum was definitely polar in origin. 

 In the other three cultures the flagellum often originated subpolar 

 and occasionally actually lateral. R. palustris, Hopkins Marine 

 Station strain, showed mainly subpolar, coiled monotrichous 

 flagella which appeared quite different from those of R. palustris, 

 NCIB 8252. This latter strain also had some individuals with a 

 subpolar flagellum but the wavelength was only half that of the 

 former strain. R. spheroides, NCIB 8253, showed a goodly num- 

 ber of subpolar flagella of long wavelength, or coiled flagella, and 

 was very similar to the Hopkins Marine Station of R. palustris. In 

 this strain the flagellum was often lateral. ( See Fig. 60. ) 



144 



