Optimum temperature, 25° C. Antagonistic properties: Highly antago- nistic. Produces an antibacterial agent, neomycin, and an antifungal agent, fradicin. Source: Isolated once from adobe soil in California. Habitat: Soil. 106. Streptomyces albosporeus (Krain- sky, 1914) Waksman and Henrici, 1948. {Actinomyces albosporeus Krainsky, Cent. f. Bakt., II Abt., 41, 1914, 649; also see Waksman and Curtis, Soil Sci., 1, 1916, 99; Waksman and Henrici, in Manual, 6th ed., 1948, 954.) al.bo.spo're.us. L. adj. alhus white; Or. noun spora a seed; M.L. noun spora a spore; M.L. adj. albosporeus white-spored. Aerial mycelium: Hyphae straight, branching, with occasional spirals. Spores spherical or ellipsoidal, 0.8 to 1.2 by 1.0 to 1.8 microns. Gelatin stab: Yellow growth, changing to red, wuth hyaline margin. Liquefaction in 35 days. Agar: Minute, cream-colored colonies. Synthetic agar: Spreading growth, color- less with pink center, becoming brownish. Aerial mycelium white, covering the whole surface. No soluble pigment. Starch agar: Growth thin, spreading, transparent, with red tinge. Glucose agar: Growth spreading, red, wrinkled, radiate, entire. Glucose broth: Pinkish surface ring. Litmus milk: Scant, pink ring. Not coagu- lated, not peptonized. Potato: Growth thin, spreading, wrin- kled, gray, becoming brown with greenish tinge. The pigment formed is not soluble. Starch is hydrolyzed. Nitrites produced from nitrates. Aerobic. Optimum temperature, 37° C. Antagonistic properties: Positive. Source: Isolated from soil. Habitat: Soil. 107. Streptomyces purpurascens Lin- denbein, 1952. {Streptomyces purpurascens Brockmann, Bauer and Borchers (nomen nudum), Chem. Ber., 84, 1951, 700; Linden- bein. Arch. f. Mikrobiol., 17, 1952, 371.) pur.pur.as'cens. L. part. adj. purpuras- cens making purple. Vegetative growth: Usually heavy, red to carmine-red to almost purple. Aerial mj'celium: Cottony, white. Spirals observed in 6 days, but they may be lacking altogether. Gelatin: Heavy, light brown surface growth. Aerial mycelium cottony, white. Soluble red-brown pigment. Rapid lique- faction. Agar: Light brown growth with dark brown reverse. Aerial mycelium velvety, gray. Synthetic agar: Tj'pical carmine-red growth. Aerial mycelium cottony, chalk- white. Soluble brown-red pigment. Glucose asparagine agar: Carmine-red growth. Aerial mycelium cottony, white. Soluble orange pigment. Ca-malate agar: Carmine-red growth. Aerial mycelium chalk-white. Soluble brick- red pigment. Starch agar: Lichenoid, light carmine- colored growth. Aerial mycelium white. No soluble pigment. Glucose agar: Lichenoid, red to red-brown growth. Aerial mycelium cottony, chalk- white. Soluble light brown pigment. Glucose broth: Heavy pellicle with limited bottom growth, carmine-red, later copper-red. Aerial mycelium powdery, chalk-white. Soluble carmine-red pigment. Milk: Lichenoid, red to dark brown growth. Aerial mycelium velvety to cottony, white. No proteolysis. Potato: Very good, brownish to reddish growth. Aerial mycelium velvet}^ white. No soluble pigment. Starch is actively hydrolyzed. Very good, white to red growth on cel- lulose. Antagonistic properties: Produces rhodo- mycin. Comment: On continued growth on syn- thetic media, the culture may lose the prop- erty to produce the typical pigment; it can be regained, however, by growing on organic media. Source: Isolated from soil. Habitat: Soil.
