FAMILY STREPTOMYCETACEAE 933 



II. Saprophytes; thermophilic. 



A. Starch hydrolyzed. Yellowish growiih on potato. 



57. Streptomyces Ihermophilus . 



B. Starch not hydrolyzed. Abundant, dark-colored growth on potato. 



58. Streptomyces thermofuscus . 

 III. Plant parasites. 



A. Tyrosinase reaction positive ; aerial mycelium gray -white. 



59. Streptomyces scabies. 



B. Tyrosinase reaction negative; attacks sweet potatoes. 



60. Streptomyces ipomoea. 



IV. Isolated from animal tissues. In the animal body, hyphae often show clavate 

 enlargements at the ends. 



A. Limited proteolytic action in gelatin, milk, coagulated egg-albumin or 



fibrin. 



1. Color of vegetative growth golden-brown. 



61. Streptomyces fordii. 



2. Color of vegetative growth pink. 



a. Sparse white aerial mycelium. 



62. Streptomyces africanns. 



aa. Formation on mycelium of bodies similar to Thermoactinomyces . 



63. Streptomyces gallicus. 



aaa. Yellowish-pink growth on potato plug; scant white aerial 

 mycelium. 



64. Streptomyces pelletieri. 



3. Color of vegetative growth white. 



65. Streptomyces lister i. 



4. Vegetative growth cream-colored, scant white aerial mycelium. 



66. Streptomyces upcottii. 



5. Growth very limited on various media, except on potato plug; no 



liquefaction of gelatin. 



67. Streptomyces hortonensis . 



B. Strong proteolytic action in gelatin and milk. 



1. Xo pigment produced. 



a'. No growth on potato plug. 



68. Streptomyces gibsonii. 



a^. Moist, membranous growth on potato plug; diastase formed. 



69. Streptomyces beddardii. 



70. Streptomyces kimberi. 



a^. Extensive growth on potato media; white powdery aerial 



mycelium, 

 a* Abundant growth on potato plug, becoming black; white-gray 



aerial mycelium; plug discolored. 



71. Streptomyces somaliensis. 

 a*. Pink-colored growth on some media. 



72. Streptomyces panjae. 



a^. Profuse white aerial mycelium on most media, spiral formation. 



73. Streptomyces willmorei. 



1. Streptomyces albus (Rossi Doria (Streptotrix alba Rossi Doria, Ann. d'Ist. 

 emend. Krainsky) Waksman and Henrici. d'Ig. sper. di. Univ. di Roma, 1, 1891, 



