Antibiotics, Baltimore, 1953, 94; not Streptothrix Candida Petruschky, Verhandl. d. Kongr. f. innere Med., 1898.) can'di.dus. L. adj. candidus very white. Vegetative growth; Organism grows well on various media. Aerial mycelium: Sporophores long, straight or wavy, but never forming spirals. Spores cylindrical, elongated, 0.7 by 1.5 to 2.0 microns; on maturing, some become more rounded. Gelatin: Slow liquefaction. Agar: Lichenoid or smooth growth. Aerial mycelium whitish. Synthetic agar: Well developed, colorless colonies. No soluble pigment. Aerial mycel- ium cottony white. Milk: Weakly coagulated and pep- tonized. Sucrose is inverted. Starch is rapidly hydrolyzed. Good growth on cellulose. Nitrites produced from nitrates. Antagonistic properties: Weak. Source: Isolated from soil. Habitat: Soil. 102. Streptomyces alboflavus (Waks- man and Curtis, 1916) Waksman and Hen- rici, 1948. {Actinomyces alboflavus Waksman and Curtis, Soil Sci., 1, 1916, 120; Waks- man and Henrici, in Manual, 6th ed., 1948, 954.) al.bo.fla'vus. L. adj. albus white; L. adj. flavus yellow; M.L. adj. alboflavus whitish yellow. Aerial mycelium: Straight, branching mycelium, with very little tendency to form spirals. Very few ellipsoidal conidia formed. Gelatin stab: Abundant, colorless surface growth. Liquefaction occurs in 35 days. Agar: Restricted, cream-colored growth. Synthetic agar: Growth glossy, colorless, spreading, becoming yellowish. Aerial mycelium white, powdery, with yellow- tinge. Starch agar: Thin, yellowish, spreading growth. Glucose agar: Growth restricted, much- folded, creamy with sulfur-yellow surface. Glucose broth: White, cylindrical colonies on surface, later flaky mass in bottom of tube. Litmus milk: Pinkish ring. No coagula- tion. Peptonized, becoming alkaline. Potato: Moist, cream-colored, wrinkled growth. The pigment formed is not soluble. Starch is hydrolyzed. Nitrites produced from nitrates. Aerobic. Optimum temperature, 37° C. Antagonistic properties: Positive. Source: Isolated once from orchard soil. Habitat: Soil. 103. Streptomyces flocculus (Duche, 1934) Waksman and Henrici, 1948. {Acti- nomyces flocculus Duche, Encyclopedie My- cologique, Paris, 6, 1934, 300; Waksman and Henrici, in Manual, 6th ed., 1948, 955.) floc'cu.lus. L. noun ^occMS a flock of wool; M.L. dim. adj. flocculus somewhat like a flock of wool. Vegetative growth: Velvety surface with cottony or floccose edge. Gelatin: Very limited growth. Slow lique- faction. Agar: Cream-colored growth, later covered with white aerial mycelium; no soluble pigment. Glucose asparagine agar: Weak growth; limited cream-colored colonies hardly raised above the surface of the medium; occasionally abundant growth is produced with white aerial mycelium and colorless on reverse side. Synthetic agar: Cream-colored growth, later covered with white aerial mycelium; no soluble pigment. Glucose asparagine solution: Branching, immersed filaments, 0.8 micron in diam- eter ; aerial mycelium 1 .0 by 1 .2 microns with numerous conidia; flakes settle to the bot- tom of the tube. Peptone solution: Pointed colonies; cream-colored on surface of medium. Tyrosine medium: Whitish growth with- out any pigment. Milk: Rose-colored growth; slow pep- tonization. Potato : Punctiform growth covered with white aerial mycelium; faint yellowish pigment. Coagulated serum: Cream-colored
