274 



THE ACTINOMYCETES, V 



Aerial mycelium gray. Soluble pigment 

 brownish. 



Starch agar: Growth brownish-yellow. 

 Aerial mycelium white, turning gray. Hy- 

 drolysis. 



Nutrient agar: Growth pale orange-yellow. 

 No aerial mycelium. 



Potato: Growth heavy, pinkish-gray with 

 purplish tinge. Soluble pigment reddish- 

 brown. 



Gelatin: Surface pellicle pale yellow. No 

 soluble pigment. No liquefaction in 15 days 

 at 26°C. Melanin-negative. 



Milk: Yellow-gray ring. Coagulation and 

 peptonization. 



Nitrate reduction: Negative. 



Cellulose: No growth. 



Optimum temperature: 35-37°C. 



Tyrosinase reaction: Negative. 



Carbon utilization: Utilizes n-galactose, 

 sucrose, maltose, sodium citrate and succi- 

 nate; does not utilize xylose, arabinose, 

 lactose, rhamnose, raffinose, inulin, manni- 

 tol, sorbitol, inositol, and salicin. 



Antagonistic properties: Produces chlor- 

 tetracycline. 



Habitat: Soil in Japan. 



Remarks: Related to S. aureofaciens. 



223. Streptomyces scabies (Thaxter, 1891) 

 Waksman and Henrici, 1048 (Thaxter, R. 

 Ann. Kept. Conn. Agr. Expt. Sta. 1891, p. 

 153). 



Morphology: Sporophores much branched, 

 wavy or slightly curved; occasionally form 

 spirals. Spores cylindrical, 0.8 to 1.0 by 1.2 

 to 1.5 M (Fig. 45). 



Sucrose nitrate agar: Growth abundant, 

 wrinkled, raised, gray to cream-colored. 

 Aerial mycelium cottony, white to gray. 



Glucose -asparagine agar: Growth re- 

 st ricted, folded, cream-colored. Aerial my- 

 celium scant, white to gray. 



Nutrient agar: Growth wrinkled, white to 

 straw-colored, opalescent to opaque. No 

 aerial mycelium. Soluble pigment deep 

 golden brown. 



Potato: Growth gray, opalescent, becom- 

 ing wrinkled, black. Aerial mycelium scant, 

 grayish-white. Color of plug brown. 



Gelatin: Surface growth cream-colored, 

 becoming brown. Liquefaction slow. Soluble 

 pigment yellowish. 



Milk: Surface ring brown, with greenish 

 tinge. Coagulation and peptonization lim- 

 ited. 



Starch: Hydrolysis. 



Figure 45. Sporophort 

 of E. Baldacci, University 



of transparent spores, X 15,000 (Courtesy 



