■98 



ORDER V. ACTINOMYCETALES 



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 



