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.
