COMPREHENSIVE KEY 1013 



Organisms arranged singly; amines, ammonia and nitrogen produced 



Eiibactcriuiii p. 562 

 {E. obstii) 

 Organisms arranged predominantly in Y-shaped forms suggestive of false branching; 

 acid from glucose and galactose; gelatin not liquefied. . . .Kamibaclerium p. 563 

 (R. pleuriticum) (See also Corynehacterium diphtheroides .) 



45. No acid from carbohydrates Eubaclerium p. 552 



Acid from carbohydrates 46 



46. Acid from glucose, lactose and fructose 49 



Acid from glucose and lactose but not from fructose. . . .Catenabacterium p. 560 



(C. lottii) (See also Lactobacillus caucasicus.) 



Acid from glucose and fructose but not from lactose 47 



Acid from glucose but not from lactose or fructose 53 



47. Organisms pathogenic to mice and rabbits; cause urinary-tract infection in horses, 



cattle, sheep and dogs; propionic acid not produced from lactic acid; strictly ana- 

 erobic Corynebacterium p. 579 



(C. renale) 

 Not as above 48 



48. Organisms found mainly in fermenting foods; propionic acid produced from lactic acid; 



microaerophilic to anaerobic Propionibacterium p. 569 



No propionic acid produced from lactic acid; microaerophilic to anaerobic 



Lactobacillus p. 542 



49. Butyric acid produced 50 



Propionic acid produced 51 



No propionic or butyric acid produced 52 



50. Organisms occurring in very long chains Catenabacterium p. 560 



(C catenaforme) 



Organisms occurring singly, in pairs and in clumps Eubacterium p. 552 



{E. parvum) (See also Corynebacterium avidum.) 



51. Strictly anaerobic Eubacterium p. 552 



{E. disciformans) 

 Microaerophilic to anaerobic; propionic acid produced from lactic acid; catalase-posi- 

 tive Propionibacterium p. 569 



52. Long rods, 0.3 by 8.0 microns, with tapered, rounded or swollen ends; often occurring 



in short or long chains Catenabacterium p. 560 



(C. leptotrichoides) 

 Slender rods, 0.5 to 0.7 by 2 to 8 microns, occurring in short or long chains; bifurcations 

 common; produce lactic and volatile acids from glucose; microaerophilic to anaerobic 



Lactobacillus p. 5^2 

 Rods 1.0 by 3.0 microns; produced in short or long chains; acetic and lactic acids pro- 

 duced from glucose Eubacterium p. 552 



Note: E. crispatum has a similar sugar-fermentation range to that of Lac- 

 tobacillus bifidus, but acetic acid appears to predominate. 



53. Propionic acid produced 55 



Butyric acid produced from lactic acid; acid from glucose and maltose 



Butyribacterium p. 577 

 (B. retigeri) 

 No propionic or butyric acid produced 54 



54. Organisms arranged in short to very long chains Catenabacterium p. 560 



{C. nigrum) 

 Organisms occurring singly and in groups arranged in a palisade or Chinese-letter 



fashion Corynebacterium p. 579 



(C. granulosum and C. parvum) 



