SPECIES OF STREPTOMYCES 83 



Vegetative growth: Soft, on all media. Long, branched hyphae, with 

 numerous staining granules. 



Aerial mycelium: Hyphae long, sporulating, producing no spirals. Spores 

 oval to elliptical, or spherical. 



Synthetic agar: Growth good, crumb-like, light yellow. Aerial mycelium 

 powdery, white; soluble pigment golden yellow. 



Nutrient agar: Growth poor, shiny, golden yellow. Aerial mycelium thin, 

 powdery. Soluble pigment golden yellow. 



Glucose agar: Growth yellowish with tinge of orange. Aerial mycelium 

 powdery, grayish white; soluble pigment light yellow to golden yellow. 



Potato: Growth heavy, yellow, becoming brownish yellow or orange. 

 Aerial mycelium cottony white to yellowish white. 



Gelatin: Surface growth heavy, light to dark yellow. Aerial mycelium 

 powdery, white. Liquefaction strong. Soluble pigment yellow-brown to deep 

 brown in liquefied portion. 



Milk: Growth abundant, colorless, reverse light yellow. Aerial mycelium 

 cottony, snow-white becoming yellowish. Peptonization strong. Acidity 

 slight. 



Starch: Growth thin, colorless. Aerial mycelium powdery, white. Hydrol- 

 ysis strong. No soluble pigment. 



Glucose broth: Surface growth heavy yellowish; submerged flakes yel- 

 lowish ; soluble pigment golden yellow. 



Cellulose: Growth poor. 



Glucose-asparagine agar: Growth smooth, almost colorless to yellowish. 

 Aerial mycelium powdery, white; soluble pigment faint yellow. 



Calcium malate agar: Growth good, thin, smooth, colorless to faintly 

 yellowish. Aerial mycelium powdery, grayish white. 



Antagonistic properties: Produces actinomycin C (actinochrysin). 



77. Streptomyces gougeroti (Duch6) Waksman and Henrici. (Duch6, 

 J., Les actinomyces du groupe albus, P. Lechevalier, Paris, 1934.) 



Aerial mycelium: Aerial hyphae short, gnarled. Spores oval. 



Synthetic agar: Slow growth as punctiform colonies; cream-colored with 

 smooth edge; no aerial mycelium; no soluble pigment. 



Nutrient agar: Growth cream-colored with brownish reverse; soluble 

 pigment faint yellowish. Aerial mycelium thin, white. 



Glucose agar: Growth colorless to yellowish. Aerial mycelium thin, white. 

 No soluble pigment. 



Potato: Growth slow, greenish-tinged. Aerial mycelium thin, white. No 

 soluble pigment. 



Gelatin: Surface growth heavy, cream-colored. Aerial mycelium thin, 

 white. No pigmentation. Liquefaction strong. 



