106 GENERAL SYSTEMATIC BACTERIOLOGY 



2. Small, aerobic rods, producing a yellow pigment on gelatin or agar. 



Flavobacterium 



3. Small, aerobic rods, producing a violet pigment on solid media. 



Chromobacterium 



4. Small, aerobic rods, producing a green or blue-green pigment. 



Pseudomonas 



Key to the Genera of the Tribe Achromobactereae 

 One genus only: Achromobacter. 



Key to the Genera of the Tribe Cellulomonadeae 

 One genus only: Cellulomonas. 



Key to Genera of Tribe Erwiniae 



1. Motile rods. 



a. Flagella peritrichous Erwinia 



2. Rods motile or non-motile. Motile forms possess polar flagella. 



Phytomonas 



Key to the Genera of the Tribe Zopfeae 

 One genus only: Zopfius. 



Key to the Genera of Tribe Bactereae 



A. Ferment dextrose with production of acid or acid and gas. 



1. Gas formed from dextrose. 



a. Gas formed from lactose. 



b. Acetyl-methyl-carbinol not formed from dextrose. 



Escherichia 

 bb. Acetyl-methyl-carbinol formed. .Aerobacter 

 aa. Gas not formed from lactose. 



b. Gas formed from sucrose Proteus 



bb. Gas not formed from sucrose. . .Salmonella 



2. Gas not formed from dextrose. 



a. Acid formed from dextrose Eberthella 



AA. Do not form acid or gas from any of the carbohydrates. 



Alcaligenes 



Key to the Genera of the Tribe Encapsulateae 

 One genus only: Encapsulatus, 



Key to the Genera of the Tribe Lactobacilleae 

 One genus only: Lactobacillus. 



Key to the Genera of the Tribe Bacteroideae 

 One genus only : Bacteroides. 



Key to the Genera of the Tribe Pasteurelleae 

 One genus only: Pasteurella. 



