FAMILY III. STREPTOMYCETACEAE 



803 



powdery and white. No coagulation and no 

 digestion. Sometimes slightly reddish solu- 

 ble pigment. 



Potato: Coral-pink growth; aerial myce- 

 lium powdery, white. Plug changes slightly 

 to brown. No soluble pigment. 



Carrot: Dark reddish orange growth; 

 aerial mycelium powdery, white. Plug 

 changes very slightly to dark color. 



Egg: Colorless growth, changing to coral- 

 pink. Aerial mycelium powdery, white. 



Glycerol and glucose, but not other car- 

 bohydrates, are utilized. 



Tyrosinase not produced. 



Starch is not hydrolyzed. 



Nitrates not reduced. 



Antagonistic properties: Produces an an- 

 tiviral agent, abikoviromycin. 



Source: Isolated from soil. 



Habitat: Soil. 



113. Streptomyces viridis (Lombardo- 

 Pellegrino, 1903, emend. Krassilnikov, 1941) 

 Waksman, 1953. {Streptothrix viridis Lom- 

 bardo-Pellegrino, Riforma Med., 19, 1903, 

 1065; also see Cent. f. Bakt., I Abt., Ref., 

 35, 1904, 761; Actinomyces viridis Sanfelice, 

 Cent. f. Bakt., I Abt., Orig., 36, 1904, 355; 

 Krassilnikov, Guide to the Actinomycetes, 

 Izd. Akad. Nauk, U.S.S.R., Moskau, 1941, 

 34; Waksman, in Waksman and Lechevalier, 

 Actinomycetes and Their Antibiotics, 

 Baltimore, 1953, 101.) 



vi'ri.dis. L. adj. viridis green. 



Vegetative growth: Green to dark green 

 on all media. No soluble pigment. 



Aerial mycelium: Well developed on all 

 media, cottony, whitish to grayish. Sporo- 

 phores long or short, straight, forming no 

 spirals but frequently producing broom- 

 shaped clumps. Spores cylindrical, 0.7 to 

 0.8 by 1.0 to 1.5 microns. 



Gelatin: No liquefaction in 13 to 15 days. 



Milk: Not coagulated; not peptonized. 



Starch is not hydrolyzed. 



No growth on cellulose. 



Nitrites weakly produced from nitrates. 



Antagonistic properties: None; certain 

 strains give positive activity. 



Comments: According to Krassilnikov 

 (op. cit., 1941, 34), Streptomyces lipmanii 

 and Streptomyces verne represent strains of 

 this species; Streptomyces viridis sterilis is 



also listed as a strain that lost the capacity 

 to produce aerial mycelia. 



Source: Isolated from soil. 



Habitat: Soil. 



114. Streptomyces thermophilus (Gil- 

 bert, 1904) Waksman and Henrici, 1948. 

 (Actinomyces thermophilus Gilbert, Ztschr. 

 f. Hyg., 47, 1904, 383; not Actinomyces 

 thermophilus Berestnew, Inaug. Diss., 

 Moskow, 1897; Waksman and Henrici, in 

 Manual, 6th ed., 1948, 956.) 



ther.mo'phi.lus. Gr. noun therme heat; 

 Gr. adj. philus loving; M.L. adj. thermo- 

 philus heat-loving. 



Description taken from Waksman, Um- 

 breit and Cordon (Soil Sci., 47, 1939, 49). 



Aerial mycelium: Hyphae straight, co- 

 nidia formed. 



Gelatin: Liquefaction. No pigment. 



Agar: No pigment formed. 



Synthetic agar: At 28° C, deep colorless 

 growth, thin white aerial mycelium; no 

 soluble pigment. 



Starch agar: Yellowish growth with 

 white-gray, powdery aerial mycelium. 



Milk: Proteolysis. 



Potato plug: Yellowish growth with no 

 aerial mycelium, the plug usuallj' being 

 colored brown. 



Starch is hydrolyzed. 



Aerobic. 



Temperature relations: Optimum, 50° C. 

 Good growth at 28° C. Usually no growth 

 at 60° C. Some strains are incapable of 

 growing at 28° whereas others seem to grow 

 well even at 65° C. 



Antagonistic properties: Some strains 

 produce the antibiotic thermomycin. 



Source: Unknown. 



Habitat: Found in soil, hay and composts. 



115. Streptomyces thermiodiastaticus 



(Bergey et al., 1923) Waksman, 1953. 

 (Var. a, Bergey, Jour. Bact., 4, 1919, 301; 

 Actinomyces thermodiastaticus Bergey et al.. 

 Manual, 1st ed., 1923, 370; Waksman, in 

 Waksman and Lechevalier, Actinomycetes 

 and Their Antibiotics, Baltimore, 1953, 102.) 

 ther.mo.di.a.sta'ti.cus. Gr. fem.n. 

 therme heat; Gr. adj. diastaticus diastatic; 

 M.L. adj. thermodiastaticus (probably in- 

 tended to mean) thermophilic and diastatic. 



