552 Bulletin 167 



Comparative Studies of Seven Representative Strains 

 Greex Fluorescent Sap Bacteria and 

 Six Known SpEcies. 



After having- separated the 42 strains into groups in tin- 

 preliminary studies as shown above, 7 representative strains 

 were chosen for a more thorough study of their morphological, 

 cultural, physical and biochemical features. The strains selected 

 follow : From group one, strain CXLV, capsulated, and strain 

 CXII, a slow liquefier, non-capsulated ; from group two, strain 

 CXLVIII a rapid liquefier, non-capsulated and, in contrast to 

 the other groups, able to grow in asparagin Uschinsky solu- 

 tion ; from group three, strain XXXVI, a nitrate reducer which 

 does not grow on Cohn's solution ; from group four, strain LI, 

 a nitrate reducer which grows on Cohn's solution ; from group 

 five, strain CXL-, a very tardy liquefier and casein digester, 

 producing abundant hydrogen sulphid, but not reducing nitrates; 

 from group six, strain CXV, a strong hydrogen sulphid 

 producer, a rapid liquefier, growing at 37 C, Gram positive, 

 and at most only doubtfully fluorescent. In addition, 6 strains 

 of known species were introduced for comparative purpose- 

 These are as follows : 



Ps. alba t Zimmermann) Mignla. 



Ps. iiuorescens (Flitgge) 



Ps. longa (Zimmermann 1 



Ps. mesenterica (Tataroff) 



Ps. tenuis 1 Zimmermann 1 



Ps. putrida (Fliigge) 



The first five cultures were obtained from Krai's Labora- 

 torium, while the culture of Ps. putrida, added to the station 

 series some years ago, was supplied by Now. 



The 13 strains were rejuvenated by preliminary cultiva- 

 tion, while frequent replating assured the purity of the cul- 

 tures. For methods and procedures see pages 525 and ?2i_). The 

 Societ} Card was used as a basis for the comparative studies 

 and, in general, as in the preliminary studies, the methods em- 



