172 MANUAL OF DETERMINATIVE BACTERIOLOGY 



isolated from water, soil and similar sources. Pigment is usually yellow and is not 



water-soluble. 



Key to yellow and other chromogenic species in genus Pseudomonas. 



1. Colonies yellow. 



a. Gelatin liquefied. 



b. Nitrites produced from nitrates. 



c. Acid and gas produced from glucose. 



1 . Pseudomonas fermentans . 

 cc. Acid but no gas from glucose. 



2. Pseudomonas trifolii. 



3. Pseudomonas xanthe. 

 ccc. Action on glucose not recorded. 



4. Pseudomonas caudata. 

 bb. Nitrites not produced from nitrates. 



c. Litmus milk acid or ferment lactose. 



5. Pseudomonas perlurida. 



6. Pseudomonas iridescens. 

 cc. Litmus milk not coagulated. Yellow sediment. 



7. Pseudomonas turcosa. 

 ccc. Litmus milk slimy, alkaline. 



8. Psezidomonas ochracea. 

 aa. No liquefaction of gelatin. 



b. Nitrites produced from nitrates. 



c. Litmus milk, slow coagulation. 



9. Pseudomonas cerevisiae. 

 cc. Litmus milk, acid but no digestion. 



10. Pseudomonas arguta. 

 ccc. No growth in litmus milk. 



11. Pseudomonas subcreta. 

 cccc. Action on litmus milk, not recorded. 



12. Pseudomonas pictorjun. 

 bb. Nitrites not produced from nitrates. 



c. Butter colored pellicle on litmus milk. 



13. Pseudomonas lacunogenes. 

 cc. No surface pellicle. 



14. Pseudomonas segnis. 



2. Colonies on gelatin blue center surrounded by yellow zone with peripheral 



green zone, 

 a. Gelatin liquefied. 



b. Nitrites produced from nitrates. 



15. Pseudomonas lemonnieri. 



1. Pseudomonas fermentans von Wol- with rounded ends, occurring singly and 



zogen Kiihr. (von Wolzogen Kiihr, in pairs. Motile, with a single or occa- 



Cent. f. Bakt., II Abt., 85, 1932, 228; sionally 2 or 3 polar flagella. Gram- 



Flavobacterium fermentans Bergey et al., negative. 



Manual, 4th ed., 1934, 155.) From Gelatin colonies: Circular, grayish, 



Latin, fermento, to ferment. with rapid liquefaction. 



Rods: 0.4 to 0.6 by 1.7 to 3.4 microns. Gelatin stab : Liquefaction crateriform. 



