Sucrose not inverted. Starch is hydrolyzed. Antagonistic properties: No activity against mycobacteria. Source: Isolated from soil. Habitat: Soil, food products and pota- toes. 52. Streptoniyces cyliiidrosporus (Krassilnikov, 1941) Waksman, 1953. {Acti- nomyces cylindrosporus Krassilnikov, Guide to the Actinom3'cetes, Izd. Akad. Nauk, U.S.S.R., Moskau, 1941, 57; Waksman, in Waksman and Lechevalier, Actinomycetes and Their Antibiotics, Baltimore, 1953, 68.) cy.lin.dro'spo.rus. Gr. mas.n. cylindrus a cylinder; Gr. fem.n. spora a seed; M.L. noun spora a spore; M.L. adj . cylindrosporus cylinder-spored. Vegetative growth: Cultures readily lose capacity to produce spores. Aerial mycelium: Well developed, cot- tony or velvety, grayish white. Sporo- phores straight; spores cylindrical, 0.7 by 1.0 to 1.7. microns. Gelatin: Liquefaction. Agar: Dark brown growth with white aerial mycelium. Synthetic agar: Velvety, dark brown or chocolate colonies. White-gray aerial myce- lium. Milk: Slightly coagulated, weakly pep- tonized with milk becoming brown to almost black. Sucrose not inverted. Starch is weakly hydrolyzed. No growth on cellulose. Nitrites produced from nitrates. Antagonistic properties: None. Source: Isolated from soil. Habitat: Soil. 53. Streptomyces viridochromogenes (Krainsky, 1914) Waksman and Henrici, 1948. (Actinomyces viridochromogenes Krain- sky, Cent. f. Bakt., II Abt., 4I , 1914, 662; Waksman and Henrici, in Manual, 6th ed., 1948, 942.) vi.ri.do.chro.mo'ge.nes. L. adj. viridis green; Gr. noun chroma color; Gr. v. suffix -genes producing; M.L. adj. viridochromo- genes producing green color. Aerial mycelium: Hyphae with numer- ous open spirals, 3 to 5 microns in diameter, occurring as side branches; spores short, ellipsoidal or spherical, 1.25 to 1.50 microns. Gelatin: Cream-colored surface growth, becoming greenish. Slow liquefaction. Agar: Abundant, restricted, gray growth with greenish tinge. Synthetic agar: Spreading growth, cream- colored with dark center, becoming dark green; reverse yellowish to light cadmium. Aerial mycelium abundant, spreading, white, becoming light green. Starch agar: Circular, spreading, yellow- ish colonies. Glucose agar: Abundant, spreading, wrinkled, gray growth, becoming black. Glucose broth: Dense, solid ring, brown- ish, becoming dark green. Litmus milk : Dark brown surface growth ; coagulated; peptonized, with faintly alka- line reaction. Potato: Abundant, gray-brown growth. Soluble brown pigment formed. Starch is hydrolyzed. Nitrites produced from nitrates. Aerobic. Optimum temperature, 37° C. Antagonistic properties: Active upon fungi. Source: Isolated from soil. Habitat: Soil. 54. Streptoniyces piirpureochromo- genes (Waksman and Curtis, 1916) Waks- man and Henrici, 1948. {Actinomyces purpeo- chromogenus (sic) Waksman and Curtis, Soil Sci., /, 1916, 113; Streptomyces purpeo- chromogenus (sic) Waksman and Henrici, in Manual, 6th ed., 1948, 943.) pur.pur.e.o.chro.mo'ge.nus. L. adj. pur- pureus purple-colored; Gr. noun chroma color; Gr. v. suffix -genes producing; M.L. adj. purpureochromogenes producing purple color. Aerial mj'celium: Branching mycelium and hyphae with few imperfect spirals. Conidia spherical, 0.75 to 1.0 micron in di- ameter. Gelatin stab: Slow, brownish surface growth. Slow liquefaction. Agar: Gray to brownish growth, becom- ing dark brown, almost black. Synthetic agar: Slow, restricted, smooth,
