2 . Desulfovihrio 



The several species of Desidfovibrio listed in Bergey's Manual, 

 6th ed., are stated to be morphologically indistinguishable. A 

 culture was received from Dr. C. E. ZoBell of the Scripps Oceano- 

 graphic Institute in La Jolla, California. According to Dr. ZoBell 

 the culture was not pure and this was verified by staining. The 

 organism pictured was most typical for a vibrio and it is repro- 

 duced with this questionable identification (Fig. 22). 



Flagellar Characteristics 



Assuming the organism referred to above to be a Desidfovibrio 

 species, the flagellation is polar monotrichous. The flagellar wave- 

 length is quite long, averaging 3.0 microns. Since a pure culture 

 was not available for study, nothing can be said about variations. 



21. Cellvibrio 



Bergey's Manual, 6th ed., lists four species of Cellvibrio which 

 are differentiated on the bases of growth on glucose and starch 

 agar and degree of pigmentation. Several cultures were obtained 

 for study. One culture was obtained from W. B. Haynes of 

 the Northern Regional Research Laboratory, U.S.D.A., Peoria, 

 Illinois. This culture (B-668) was simply labeled Cellvibrio sp. 

 Four cultures were obtained from Dr. H. W. Reuszer of Purdue 

 University. Two were labeled Cellvibrio vulgaris, strain 6, and 

 strain 122. Two were labeled Cellvibrio fulviis, strain 18, and 

 strain 102. All five of these cultures grew well on glucose agar 

 slants, producing at first a yellow water-insoluble pigment which 

 later turned brown. In glucose-yeast extract broth growth was 

 fair with the formation of a brown pellicle. In dextrose semisolid 

 agar all cultures produced a very slight acidity under aerobic con- 

 ditions but no acidity under anaerobic conditions. Physiologically 

 and culturally the five cultures appeared to be more or less iden- 

 tical. 



Flagellar Characteristics 



All four of the Reuszer strains showed the same two types of 

 flagellation, differing only in the relative proportions of the two 

 types. C. fulviis, Reuszer strain 18, showed mainly small curved 

 rods with single polar flagella of relatively long wavelength as 

 illustrated in Fig. 23b. Also present in lesser numbers was a small 

 straight rod with a single polar flagellum of relatively short wave- 



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