214 COMMITTEE REPORT 



BB. Rods 

 C. Curved rods. Spirillaceae 



D. Short comma-like rods. One-three short flagella Vibrio 



DD. Long spirals, five-twenty flagella Spirillum 



CC. Straight rods 

 D. No endospores 

 E. Rods of irregular shape or showing branched or filamentous 

 involution forms. 

 F. Animal parasites. Cells of irregular shape. Staining un- 

 evenly. 



G. Acid fast Mycobacterium 



GG. Not acid fast 



H. Cells elongate, fusiform Fusiformis 



HH. Cells not fusiform, sometimes branching 



I. Gram positive. Slender, sometimes clubbed 



rods Corynebacterium 



II. Gram negative. Rods sometimes form threads. 



Characteristic honey-like growth on potato. .Pfeifferella 

 FF. Not animal parasites. Cells staining unevenly and with 

 branched or filamentous forms at certain stages. Never 

 acid fast. 

 G. Metabolism simple, growth processes involving oxida- 

 tion of alcohol or fixation of atmospheric nitrogen (lat- 

 ter in symbiosis with green plants) • 

 H. Cells minute, symbiotes in roots of leguminous 



plants Rhizobium 



HH. Oxidizing alcohol, branching forms common. .. .Acetobacter 

 GG. Not as above. Proteus-like colonies. 



H. Not attacking carbohydrates . Gram -f- Zopfius 



HH. Fermenting glucose and sucrose. Gram — Proteus 



EE. Regularly formed rods 

 F. Metabolism simple, growth processes involving oxidation of 

 carbon, hydrogen or their simple compounds or the fixa- 

 tion of atmospheric nitrogen. Nitrobacteriaceae 

 G. Fixing nitrogen or oxidizing its compounds 

 H. Fixing nitrogen 



Cells large; in soil Azotobacter 



HH. Oxidizing nitrogen compounds 



I. Oxidizing ammonia Nitrosomonas 



II. Oxidizing nitrites Nitrobacter 



GG. Not as above 



H. Oxidizing hydrogen Hydrogenomonas 



HH. Not as above, using simpler carbon compounds 



I. Oxidizing CO Carboxydomonas 



II. Oxidizing CH 4 Methanomonas 



FF. Not as above 



G. Flagella usually present, polar. 



Pseudomonadaceae Pseudomonas 



GG. Flagella when present peritrichic. 

 Bacteriaceae 



