bacteria and which is identical with acti- thiazic acid or thiozolidone. Relationships to other species: Resembles Streptomyces roseochromogenes in the color of the growth and in the slow or no lique- faction of coagulated serum or gelatin. S. roseochromogenes differs from this species in that it forms numerous open spirals and produces nitrite. Source: Isolated as strain No. 154 T-3 from soil at Kanegasaki, Iwate Prefecture. Habitat: Soil. 42. Streptomyces olivochromogenes (Bergey et al., 1925) Waksman and Henrici, 1948. {Actinomyces chromogenus 205, Waks- man, Soil Sci., 8, 1919, 106; Actinomyces olivochromogenus (sic) Bergey et al.. Man- ual, 2nd ed., 1925, 368; Streptomyces olivo- chromogenus (sic) Waksman and Henrici, in Manual, 6th ed., 1948, 941.) o.li.vo.chro.mo'ge.nes. L. noun oliva an olive; Gr. noun chroma color; Gr. v. suffix -genes producing; M.L. adj. olivochromo- genes producing an olive color. Aerial mycelium: Filaments with numer- ous close spirals. Conidia ellipsoidal. Gelatin stab: Cream-colored, spreading surface growth. Rapid liquefaction. Agar: Wrinkled, brown growth, becom- ing gray-green. Synthetic agar: White, spreading growth. Aerial mycelium ash-gray with brownish tinge. Starch agar: Transparent, spreading growth. Glucose agar: Abundant, natal-brown to almost black growth, entire margin. Glucose broth: Thin, brown growth; flaky sediment. Litmus milk: Dark brown ring; coagu- lated; peptonized, becoming alkaline. Potato: Small, wrinkled, black colonies. Soluble brown pigment formed. Starch is hydrolyzed. Nitrites produced in trace amounts from nitrates. Aerobic. Optimum temperature, 37° C. Antagonistic properties : Positive. Source: Isolated from soil. Habitat: Soil. 43. Streptomyces resistomycificus Lin- denbein, 1952. {Streptomyces resistomycificus Brockmann and Schmidt-Kastner {nomen nudum), Naturwiss., 38, 1951, 479; Linden- bein, Arch. f. Mikrobiol., 17, 1952, 376.) re.sis.to.my.ci'fi.cus. L. v resisto to resist; Gr. mas.n. myces fungus; L. v. facio to make; L. comb. adj .ending -ficxis pro- ducing; M.L. adj. resistomycificus making re- sistant to a fungus; producing resistomycin. Aerial mj-celium: Hyphae long with curl- ing tips. Spores short, ellipsoidal. Pigment of mycelium becomes pink to pink-gray. Gelatin: Dark brown growth. Aerial mycelium powdery, white-gray. Soluble chestnut-brown pigment. Liquefaction. Agar: Crumb-like growth. Aerial myce- lium powdery blue-gray. Soluble dark brown pigment. Synthetic agar: Crumb-like, dark brown growth. Aerial mycelium velvety chalk- white, later ash-gray. Soluble red-brown pigment. Glucose asparagine agar: Crumb-like growth with light brown reverse. Aerial mycelium velvety ash-gray. Soluble yellow- brown pigment. Ca-malate agar: Strong, crumb-like growth with dark brown reverse. Aerial mycelium velvety ash-gray. Soluble ash- gray pigment. Starch agar: Lichenoid growth with red- dish brown reverse. Aerial mycelium vel- vety gray-white, later becoming red-gray. Soluble pigment lacking or uniformly red- dish brown. Glucose agar: Crumb-like growth with dark brown reverse. Aerial mycelium vel- vety chalk-white. Soluble reddish to dark brown pigment. Glucose broth: Floating, large, light yel- low colonies. Aerial mycelium cottony white to red. Soluble light yellow pigment. Milk : Lichenoid growth with dark brown reverse. Aerial mycelium velvety chalk- white, later yellowish red. Soluble dark brown pigment. Sometimes weakly pep- tonized. Potato: Brownish black growth. Aerial mycelium powdery, reddish white. Soluble dark brown pigment. Starch is actively hydrolyzed.
