FAMILY XIII. BACILLACEAE 641 



ee. Milk not fermented stormily. 



f. Slow, spongy coagulation of milk. Clot slowlj^ digested. 



72. Clostridium chromogenes. 



ff. Milk coagulated rapidly. Clot not digested. 



73. Clostridium corallinum. 



dd. Pink to orange-red pigment produced in maize mash. Nitrites 

 not produced from nitrates. 



74. Clostridium aurantibutyricum. 

 cc. Yellowish pigments produced. 



d. Yellow-orange pigment produced in various media. Indole not 

 produced. Milk actively coagulated but not stormily. Clot not 

 digested. 



75. Clostridium Jelsineum. 



dd. Canary-yellow pigment produced in various media. 



76. Clostridium flavum. 

 aa. Terminal spores. 



b. Ovoid spores. 



c. Non-motile. Gelatin and/or glucose-gelatin not liquefied. Deep red 

 pigment produced on potato slants. 



77. Clostridium carbonei. 

 cc. Motile. 



78. Clostridium haumanii. 

 bb. Spherical spores. Produces a soluble, green pigment. 



79. Clostridium virens. 



B. Cellulose typically fermented. Terminal spores. Rods distinctly swollen at sporula- 

 tion. 



1. Distinctive pigments not characteristically produced. 



a. Distinctly ovoid to ellipsoid spores, 

 b. Motile. 



c. A variety of carbohydrates, other than cellulose, are fermented after 

 prolonged incubation. 



80. Clostridium spumarum. 



cc. Carbohydrates, other than cellulose, not fermented. 



81. Clostridium werneri. 

 bb. Non-motile. 



82. Clostridium leptinotarsae. 

 aa. Spores spherical, or nearly so. 



b. Non-motile. Glucose not fermented. 



83. Clostridium cellulosolvens. 

 bb. Motile. 



c. Glucose fermented. 



84. Clostridium cellobioparum . 

 cc. Glucose not fermented. 



85. Clostridium omelianskii. 



2. Distinctive pigments characteristically produced in certain media. 



a. Distinctlj^ ovoid to ellipsoid spores, 

 b. Non-motile. 



86. Clostridium dissolvens. 

 bb. Motile. 



87. Clostridium^ thermocellum. 



aa. Spores spherical, or nearly so. Thermophilic. Glucose fermented. 



88. Clostridium, thermocellulaseum. 



