760 



ORDER V. ACTINOMYCETALES 



Soluble empire-yellow pigment formed. 

 Nitrites produced from nitrates. 

 Aerobic. 



Optimum temperature, 25° C. 

 Antagonistic properties: Some strains 

 produce actinomycin. 



Source: Isolated from soil. 

 Habitat: Soil. 



16. Streptomyces parvus (Krainsky, 

 1914) Waksman and Henrici, 1948. (Actino- 

 myces parvus Krainsky, Cent. f. Bakt., II 

 Abt., 41, 1914, 622; Waksman and Henrici, 

 in Manual, 6th ed., 1948, 939.) 



par'vus. L. adj. parvus small. 



Vegetative growth: Golden yellow to 

 brick-red, depending on composition of 

 medium. 



Aerial mycelium: Poorly developed, rose- 

 white. Sporophores produce spirals. Spores 

 spherical to ellipsoidal, 0.9 to 1.3 by 1.2 to 

 1.8 microns. 



Gelatin: Yellow colonies. Slow liquefac- 

 tion. 



Ca-malate agar: Small, j'ellow colonies 

 with light yellow aerial mycelium 



Starch agar: Same as on Ca-malate agar. 



Glucose agar: Same as on Ca-malate agar. 



Glucose broth: Hemispherical colonies in 

 bottom of tube. 



Litmus milk : Rapidly coagulated and pep- 

 tonized. 



Diastatic action good. 



Good growth on cellulose. 



Nitrites weakly produced from nitrates. 



Aerobic. 



Optimum temperature, 25° C. 



Antagonistic properties: Produces actino- 

 mycin. 



Source: Isolated from garden soil. 



Habitat: Soil. 



with light brown reverse. Aerial mycelium 

 powdery ash-gray to white. Yellow to yel- 

 low-brown soluble pigment. 



Synthetic agar: Abundant, crumb-like, 

 smooth, brownish growth. Aerial mycelium 

 cottony white, later grayish or even reddish 

 gray. Soluble light brown pigment, later 

 yellow-brown. 



Glucose asparagine agar: Abundant, dif- 

 fuse, colorless growth with light yellow 

 reverse. Aerial mycelium powdery white. 

 Soluble light yellow pigment. 



Ca-malate agar: Abundant, crumb-like 

 growth with yellowish red reverse. Aerial 

 mycelium velvety, white-gray or reddish 

 gray. Soluble dark red-yellow pigment. 



Starch agar: Abundant, lichenoid growth. 

 Aerial mycelium velvety, violet-gray. Solu- 

 ble dark brown pigment. 



Glucose agar: Abundant, diffuse, color- 

 less growth with light yellow reverse. Aerial 

 mycelium abundant, powdery, seldom vel- 

 vety, light brown. Soluble yellow pigment. 



Glucose broth: Very good, colorless sur- 

 face growth, later producing heavy sedi- 

 ment. Abundant flocculent particles. Aerial 

 mycelium cottony, grayish white, tending 

 later to disappear. Soluble light yellow pig- 

 ment, becoming orange-yellow. 



Milk: Abundant, lichenoid growth. Aerial 

 mycelium gray to violet. Soluble dark brown 

 pigment. Actively peptonized. 



Potato: Abundant, lichenoid growth. 

 Aerial mycelium powdery gray. No soluble 

 pigment. 



Starch is rapidly hydrolyzed. 



No growth on cellulose. 



Antagonistic properties: Produces anti- 

 biotics. 



Source: Isolated from soil. 



Habitat: Soil. 



17. Streptomyces xanthophaeus Lin- 

 denbein, 1952. (Arch. f. Mikrobiol., 17, 

 1952, 378.) 



xan.tho.phae'us. Gr. adj. xanthophaes 

 golden, gleaming; M.L. adj. xanthophaeus 

 shining like gold. 



Gelatin: Leathery, brown, abundant 

 growth. Aerial mycelium velvety, ash-gray. 

 Soluble yellow-brown pigment. Rapid 

 liquefaction. 



Agar: Abundant, diffuse, smooth growth 



18. Streptomyces cellulosae (Krainsky, 

 1914) Waksman and Henrici, 1948. (Actino- 

 myces cellulosae Krainsky, Cent. f. Bakt., 

 II Abt., 41, 1914, 662; Waksman and Hen- 

 rici, in Manual, 6th ed., 1948, 938.) 



cel.lu.lo'sae. M.L. noun cellulosa cellu- 

 lose; M.L. gen. noun cellulosae of cellulose. 



Vegetative growth: Yellow, producing 

 soluble yellow pigment. No soluble brown 

 pigment. 



Aerial mycelium: Well developed, gray to 



