FAMILY III. STREPTOMYCETACEAE 



799 



growth; fine white aerial mycelium; slow 

 liquefaction of serum. 



Source: Culture obtained from Mr. 

 Malengon, an inspector in Morocco. 



Habitat: Unknown. 



104. Streptoniyces aiiliniycoticus 



Waksman, nom. nov. {Streptoniyces sp., 

 Leben, Stessel and Keitt, M^-cologia, 44, 

 1952, 159.) 



an.ti.mj'.co'ti.cus. Gr. pref. anti against; 

 Gr. noun myces fungus; M.L. adj. anti- 

 mycoticus against -fungus. 



Vegetative growth: On most media early 

 growth at first white and later gray; the 

 color change appears to be associated with 

 the development of dense masses of spores. 



Aerial mycelium: Spirals situated typi- 

 cally in dense groups along the main por- 

 tions of aerial hyphae, especially toward the 

 center of the colony. In early formation of 

 sporing hyphae, spirals tend to be open; 

 they become closed and compact, however, 

 prior to the formation of spores. In late 

 stages these fruiting structures tend to 

 appear ball-like rather than spiral. Spores 

 ellipsoidal, hyaline and 0.6 to 1.3 by 0.7 

 to 2.0 microns; diameter of spore spirals, 

 4 to 8 microns. 



Gelatin: Vegetative mycelium translu- 

 cent, cream-colored; sparse, white aerial 

 mycelium. Liquefaction slight at 15 days, 

 moderate at 30 days. No soluble pigment. 



Agar: Shiny, cream-colored vegetative 

 mycelium; moderate, pebbly, white aerial 

 mycelium. No soluble pigment. 



Synthetic agar: Abundant, pebbly, light 

 neutral gray aerial mycelium. No soluble 

 pigment. 



Glucose asparagine agar: Same as on 

 synthetic agar. 



Glucose peptone agar: Same as on syn- 

 thetic agar. 



Ca-malate-glycerol agar: Abundant, peb- 

 bly, light neutral gray aerial mj'celium. 

 Faint green soluble pigment. 



Potato glucose agar: Abundant, pebbly, 

 light neutral gray aerial mycelium. Faint 

 brown soluble pigment. 



Yeast extract agar: Same as on synthetic 

 agar. 



Starch: Abundant, pebblj', white to neu- 



tral gray aerial mycelium. No soluble pig- 

 ment. 



Glucose broth: Surface colonies coalesc- 

 ing, white, powdery. Liquid clear, not 

 pigmented. Small amount of flaky sediment 

 present. 



Milk: Cream-colored ring. Coagulated; 

 peptonized in 15 to 30 days, becoming 

 slightly alkaline. Yellowish orange serum, 

 slightly turbid. 



Potato: Finely wrinkled, cream-colored 

 growth with sparse, white aerial mycelium. 

 Plug darkened slightly. 



Diastatic action weak to moderate. 



Nitrites weakly produced from nitrates. 



Antagonistic properties: Produces an 

 antifungal agent, helixin. 



Source: Isolate A 158 from compost soil. 



Habitat: Soil. 



105. Streptomyces fradiae (Waksman 

 and Curtis, 1916) Waksman and Henrici, 

 1948. {Actinomyces fradii (sic) Waksman 

 and Curtis, Soil Sci., 1, 1916, 125; Waksman 

 and Henrici, in Manual, 6th ed., 1948, 954.) 



fra'di.ae. M.L. gen. noun fradiae of 

 Fradia; named for a person, Fradia. 



Aerial mycelium: Straight, branching 

 filaments and hyphae. No spirals. Conidia 

 rod-shaped or ellipsoidal, 0.5 by 0.7 to 1.25 

 microns. 



Gelatin stab: Cream-colored to brownish, 

 dense growth on liquid medium. 



Agar: Yellowish growth, becoming or- 

 ange-yellow, restricted. No soluble pig- 

 ment . 



Synthetic agar: Smooth, spreading, color- 

 less growth. Aerial mycelium thick, cottony 

 mass covering surface, sea-shell pink. 



Starch agar: Spreading, colorless growth. 



Glucose agar: Growth restricted, glossy, 

 buff-colored, lichenoid margin. 



Glucose broth: Dense, narrow, orange- 

 colored ring; abundant, flaky, colorless 

 sediment. 



Litmus milk: Faint, cream-colored ring; 

 coagulated; peptonized, becoming alkaline. 



Potato: Restricted, orange-colored 

 growth. 



The pigment formed is not soluble. 



Starch is hydrolyzed. 



Nitrites not produced from nitrates. 



Aerobic. 



