1012 COMPREHENSIVE KEY 



Acid produced from glucose and lactose but not from fructose 43 



Acid produced from glucose but not from lactose or fructose 44 



41. Large rods with rounded ends occurring as short swollen and long curved forms; bi- 



furcation common; acid produced also from maltose, galactose and sucrose; strict 



anaerobes Catenabacterium p. 560 



(C. filamentosum) 

 Slender rods sometimes undulating and filamentous; form acute V- and Y-shaped 

 angles giving an appearance of false branching; acid also from galactose and tre- 

 halose; strict anaerobes Raniibacterium p. 563 



(R. ■pseudoramosum) 

 Microaerophilic, pleomorphic organisms occurring as chains of cocci in acid media 

 anaerobically and as rods with branching forms aerobically; aerobic growth very 

 poor; propionic acid produced from lactic acid; limited gas from carbohydrates but 



none from peptone Propionibacterium p. 569 



Small, spindle-shaped cells usually occurring in long intertwined chains in liquid 

 media; ferments glucose with the production of ethyl alcohol and small amounts of 

 CO2 and acetic acid and possibly lactic and formic acids; no butyric or propionic acid 

 produced; acid and gas in glucose in 3 to 5 daj^s 



Zyniobacteriuni {Z. oroticum) p. 517 

 Rods occurring singly, in pairs or in short or long chains; strict anaerobes 



Eubacterium p. 552 

 (See also Lactobacillus brevis.) 



42. Organisms occur in long chains; acid from glucose, fructose, maltose, sucrose, galac- 



tose, xylose and arabinose; propionic acid produced among the byproducts; strict 



anaerobes Catenabacterium p. 560 



(C. contortum) 



Organisms arranged in chains and in acute V- and Y-shaped forms suggestive of false 



branches; gelatin not liquefied; nitrites not produced from nitrates; no acid from 



maltose; butyric acid is produced; strictly anaerobic. . . . Ramibacterium p. 563 



(R. dentium and R. alactolyticum) 



Microaerophilic pleomorphic organisms occurring as chains of cocci in acid media 



anaerobically and as rods with branching forms aerobically; aerobic growth very 



poor; propionic acid produced from lactic acid; limited gas from carbohydrates but 



none from peptone Propionibacterium p. 569 



Other than above; organisms occur singly or in short chains; acid from maltose; bu- 

 tyric acid is produced by one species; strict anaerobes. . . .Eubacterium p. 552 

 (E. foedans, E. quartum, E. limosum; see also Lactobacillus brevis.) 



43. Organisms occur in short or long chains with zig-zag arrangement and acute V and Y 



forms suggestive of false branching; propionic acid produced by one species 



Ramibacterium p. 563 

 (R. ramosum and R. ramosoides) 

 Organisms occur singly or in a long, sinuous chain of cells. , . .Eubacterium p. 552 



{E. rectale) 

 Note: There is a strong resemblance between the descriptions of Rami- 

 bacterium ramosoides and Eubacterium rectale. 



44. Organisms occur in short chains and as long pleomorphic filaments; acid produced 



from glucose, maltose, sucrose, galactose and glycerol; hydrogen sulfide is produced; 



gelatin is liquefied; butyric acid is produced Catenabacterium p. 560 



(C. helminthoides) 

 Organisms arranged singly; butyric acid, acetic acid and CO2 produced from glucose, 



maltose and lactic acid Butyribacterium p. 577 



{B. rettgeri) 



