flexuous. Spores catenulate, ellipsoidal, 0.8 by 1.25 microns. Gelatin: Fair growth. White aerial my- celium. Soluble light yellow pigment. Lique- faction. Agar: Poor, moist, smooth, colorless growth. No aerial mycelium. Synthetic agar: Poor, white growth. White aerial mycelium. No soluble pigment. Starch agar: Good growth. White to pale olive-buff aerial mycelium. Soluble black pigment. Glucose agar: Blackish gray growth. White aerial mycelium. Soluble, blackish gray pigment. Milk: White surface ring with yellow- green to light yellow-brown l)elow surface. White aerial mycelium. Slowly peptonized. Potato plug: Moist yellow growth. White aerial mycelium. Soluble, dark, greenish black pigment. Starch is actively hydrolyzed. No growth on cellulose. Antagonistic properties: Produces puro- mycin, an antibiotic active against certain protozoa and certain Gram-positive bac- teria. Source: Isolated from soil. Habitat: Soil. 72. Streptoniyces abikoensis Umezawa et al., 1951. (Streptomtjccs abikoensum (sic) Umezawa, Tazaki and Fukuyama, Jap. Med. Jour., 4, 1951, 331; also see Okami, Jour. Antibiotics (Japanese), 5, 1952, 479.) a.bi.ko.en'sis. M.L. adj. abikoensis per- taining to Abiko; named for Abiko, Japan. Vegetative growth: In separate colonies with very thin yellow aerial mycelium. Sub- merged mycelium yellow or yellowish brown. Soluble yellowish brown pigment. Aerial mycelium: Microscopically short, unbranched, bearing a straight conidia chain. Gelatin: Cream or brown growth. Soluble brown pigment. Crateriform liquefaction. Agar: Isolated colonies; growth cream, with triangular hole in the center. No aerial mycelium. Soluble brown pigment. Loeffler's coagulated serum: Cream growth. No aerial mycelium. No hydrolysis. Brown pigment. Blood agar: Dark cream-yellow growth. Hemolysis strong. Glucose, maltose and glj'cerol are utilized. Arabinose, xylose, rhamnose, fructose, galactose, mannitol, sorbitol, lactose, su- crose, raffinose and inulin are not utilized. Milk: Slight, brown growth. Aerial mycelium white: Soluble yellowish brown pigment. Peptonized. Carrot: Slight, wrinkled, brownish cream growth. Aerial mycelium j-ellowish white. Brown pigment. Egg: Greenish yellow growth, without aerial mycelium and with spreading reddish violet pigment. Starch is hj^drolyzed. Tyrosinase not produced. Nitrites not produced from nitrates. Antagonistic properties: Produces an antiviral agent, abikoviromycin. Source: Strain Z-1-6 was isolated from garden soil from Abiko, Chiba Prefecture. Habitat: Found in garden soils. 73. Streptomyces odorifer (Rullmann, 1895, emend. Lachner-Sandoval, 1898) Waks- man, 1953. {Cladoihrix odorifera Rullmann, Inaug. Diss., Munich, 1895; see Cent. f. Bakt., I Abt., 17, 1895, 884; and Cent. f. Bakt., II Abt., 2, 1896, 116; Actinomyces odorifer Lachner-Sandoval, Ueber Strahlen- pilze, 1898, 65; Waksman, in Waksman and Lechevalier, Actinomycetes and Their Antibiotics. Baltimore, 1953, 79.) o.do'ri.fer. L. adj odorifer fragrant. Vegetative growth: Colorless, folded. Aerial mycelium: Well developed, white or light gray. Sporophores long, straight, branching. Spirals formed according to original report (none observed by Waksman, loc. cit.). Spores spherical. Gelatin: Cream-colored surface ring. Aerial mycelium thin, white. No soluble pigment. Slow liquefaction. Agar: Folded, brown growth. Aerial my- celium white around edge. Faint soluble brown pigment. Synthetic agar: Cream-colored growth with trace of brown. Aerial mycelium heavy, cream-colored. Starch agar: Cream-colored to brown growth. Aerial m3'celium abundant, cream-
