. The actinomycetes. Actinomycetales. 270 THE ACTINOMYCETES, Vol. II. Figure 44. Verticil formation by S. roseover- ticillatus (Reproduced from: Shinobu, R. Mem. saka Univ. Ser. B, No. .">, p. 93, 1956). Hum limited to center of colonies, white to rose. Starch agar: Growth golden yellow. Aerial mycelium whitish. Potato: Growth yellow. No aerial myce- lium. No soluble pigment. Gelatin: Liquefaction strong. Colonies at bottom of liquefied zone orange-brown. No soluble pigment. Melanin-negative. Milk: Ring cream-colored. Coagulation and peptonization rapid, medium becoming strongly alkali
. The actinomycetes. Actinomycetales. 270 THE ACTINOMYCETES, Vol. II. Figure 44. Verticil formation by S. roseover- ticillatus (Reproduced from: Shinobu, R. Mem. saka Univ. Ser. B, No. .">, p. 93, 1956). Hum limited to center of colonies, white to rose. Starch agar: Growth golden yellow. Aerial mycelium whitish. Potato: Growth yellow. No aerial myce- lium. No soluble pigment. Gelatin: Liquefaction strong. Colonies at bottom of liquefied zone orange-brown. No soluble pigment. Melanin-negative. Milk: Ring cream-colored. Coagulation and peptonization rapid, medium becoming strongly alkaline. Cellulose: Growth on paper fair; cellulose decomposed. Nitrate reduction: Positive. Production of H2S: Negative. Antagonistic properties: Produces a basic antibiotic, flavomycin, similar to neomycin. Remarks: Culture similar to S. micro- flavus. Gause et al. (1957) described other closely related cultures, such as A. roseoful- vis. Type culture: [MRU 3672; ATCC 13,1(17. 214. Streptomyces roseoverticillatus Shin- obu, 1956 (Shinobu, R. Mem. Osaka Univ., B ()5:84 93, L956). Morphology: Sporophores produce abun- dant primary and secondary verticils (Fig. 44). Spores spherical to elliptical, to /*. Sucrose nitrate agar: Growth thin, mod- erate, pinkish-red. Aerial mycelium cottony, pink to pale pink. Glucose-asparagine agar: Growth red to purple-red. Aerial mycelium cottony, dull red to reddish-brown. Nutrient agar: Growth reddish-brown to deep brown. Aerial mycelium thin, pinkish to red. Soluble pigment reddish-brown to deep brown. Potato: Growth brownish-red to dull red. Aerial mycelium powdery, pink to reddish- purple. Soluble pigment brown. Milk: Growth red. Aerial mycelium pale pink. Coagulation and peptonization strong. Soluble pigment pale brown. Gelatin: Rapid liquefaction. Starch: Rapid hydrolysis. Tyrosinase reaction: Weak. Cellulose: No growth. Nitrate reduction: Positive. Carbon utilization: Utilizes fructose; inositol uncertain. Does not utilize xylose,
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