FAMILY III. STREPTOMYCETACEAE 



767 



myces 161, Waksman, Soil Sci., 8, 1919, 112; 

 Actinomyces erythreus (sic) Waksman, in 

 Manual, 1st ed., 1923, 370; Streptomyces 

 erythreus (sic) Waksman and Henrici, in 

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



e.ryth'rae.us. Gr. adj. erythraeus red. 



Vegetative growth: Growth spreading, 

 with irregular margin, developing deep into 

 the medium. Color at first white, later turn- 

 ing yellowish, agar around growth has a 

 white, milky surface. 



Aerial mycelium: Fine, branching; nu- 

 merous open spirals formed as side branches 

 of the main hyphae. 



Gelatin stab: Abundant, dense, gray 

 growth with pinkish tinge, chiefly on surface 

 of liquefied medium. 



Agar: Cream-colored growth. 



Synthetic agar: Spreading growth with 

 irregular margin, developing deep into the 

 medium; color at first white, later turning 

 yellowish; agar around growth has a white, 

 milky surface. Aerial mycelium thick, solid, 

 white. 



Starch agar: Cream-colored, circular 

 colonies, with faint greenish tinge. 



Glucose agar: Abundant, spreading, 

 cream-colored growth, later turning brown 

 chiefly on surface; center raised, lobate 

 margin. 



Glucose broth: Abundant, cream-colored 

 surface growth. 



Litmus milk: Yellowish surface zone; co- 

 agulated; peptonized, becoming alkaline. 



Potato: Wrinkled, cream-colored growth, 

 becoming yellowish. 



Starch is hydrolyzed. 



Soluble purple pigment formed. 



Nitrites produced from nitrates. 



Aerobic. 



Optimum temperature, 25° C. 



Antagonistic properties: Marked. Pro- 

 duces erythromycin. 



Distinctive character: Similar to Strep- 

 tomyces erythrochromogenes except that no 

 brown soluble pigment is formed. 



Source: Isolated from Californian and 

 Hawaiian soils. 



Habitat: Soil. 



33. Streptomyces flavogriseus (Duche, 

 1934) Waksman, 1953. (Actinomyces flavo- 



griseus Duch6, Encyclop^die Mycologique, 

 Paris, 6, 1934, 341; Waksman, in Waksman 

 and Lechevalier, Actinomycetes and Their 

 Antibiotics, Baltimore, 1953, 55.) 



fla.vo.gri'se.us. L. adj. flamis yellow; 

 M.L. adj. griseus gray ; M.L. iidj. flavogriseus 

 yellowish gray. 



Aerial mvcelium: Long, straight hj'phae 

 producing a few curling tips. Spores spher- 

 ical. 



Gelatin: Plocculent growth throughout 

 medium. No soluble pigment. Slow liquefac- 

 tion. 



Agar: Thin, cream-colored growth. Aerial 

 mycelium thin, white. No soluble pigment. 



Synthetic agar: Limited, yellowish growth 

 with reverse turning black. Aerial mycelium 

 thin, gray to mouse-gray. 



Glucose peptone agar: Yellow surface 

 growth with reverse tending to turn dark. 

 Aerial mycelium abundant, mouse-gray to 

 drab. No soluble pigment. 



Starch agar: Very limited growth. Similar 

 to that on sj'nthetic agar. 



Broth: Cream-colored surface growth in 

 clumps. Aerial mycelium gray. 



Milk: Cream-colored ring. No aerial 

 mycelium. Very rapid peptonization. 



Potato: Abundant, lichenoid growth. 

 Abundant aerial mycelium, mouse-gray to 

 drab with white edge. No soluble pigment. 



Starch is hydrolyzed. 



Source: Isolated from volcanic soils in 

 Martinique. 



Habitat: Presumabl}' soil. 



34. Streptomyces diastaticus (Krain- 

 sky, 1914) Waksman and Henrici, 1948. 

 (Actinomyces diastaticus Krainsky, Cent. f. 

 Bakt., II Abt., 4i, 1914, 662; also see Waks- 

 man and Curtis, Soil Sci., i, 1916, 116; Waks- 

 man and Henrici, in Manual, 6th ed., 1948, 

 939.) 



di.a.sta'ti.cus. Gr. adj. diastaticus sep- 

 arative; M.L. n. diastasum the enzyme di- 

 astase, hence M.L. adj. diastaticus diastatic, 

 starch-digesting. 



Aerial mycelium: Filaments may show 

 fine, long, narrow spirals. Conidia ellip- 

 soidal, 1.0 to 1.2 by 1.1 to 1.5 microns. 



Gelatin stab: Liquefaction with small, 

 cream-colored flakes in liquid. 



