brown and red reverse. Aerial mycelium velvety chalk-white. Soluble chestnut- brown pigment. Glucose broth: Sedimentary light yellow growth. No aerial mycelium. Soluble brown- ish yellow pigment. Milk: Good growth with dark brown re- verse. Aerial mycelium chalk-white, later ash-gray. Soluble dark brown pigment. Not peptonized. Potato: Good growth. Aerial mycelium chalk-white. No soluble pigment. Starch is hydrolyzed. Good growth on cellulose. Source: Isolated from soil. Habitat: Soil. 60. Streptoniyces lavendulae (Waks- man and Curtis, 1916) Waksman and Hen- rici, 1948. (Actinomyces lavendulae Waks- man and Curtis, Soil Sci., 1, 1916, 126; Waksman and Henrici, in Manual, 6th ed., 1948, 944.) la.ven'du.lae. Med.L. noun lavendula lavender; Med.L. gen. noun lavendulae of lavender color. Aerial mycelium: Hyphae coarse, branch- ing. Spirals close, 5 to 8 microns in diame- ter. Conidia ellipsoidal, 1.0 to 1.2 by 1.6 to 2.0 microns. Gelatin stab: Creamy to brownish surface growth. Liquefaction. Agar : Gray, wrinkled growth. Synthetic agar: Thin, spreading, color- less growth. Aerial mycelium cottony, white, becoming vinous-lavender. Starch agar: Restricted, glistening, trans- parent growth. Glucose broth: Abundant, flaky sedi- ment. Litmus milk: Cream-colored ring. No coagulation; peptonized, with strong al- kaline reaction. Potato: Thin, wrinkled, cream-colored to yellowish growth. Starch is hydrolyzed. Soluble brown pigment formed. Nitrites produced from nitrates. Aerobic. Optimum temperature, 37° C. Antagonistic properties: Certain strains of this organism produce antibiotics. One such antibiotic, designated as streptothri- cin, is active both in vitro and in vivo against various Gram-positive and Gram-negative bacteria, fungi and actinomycetes. Certain other strains produce an antiviral agent, ehrlichin. Source: Isolated once from orchard soil. Habitat: Soil. 61. Streptomyces venezuelae Ehrlich et al., 1948. (Streptomyces No. 844, Prid- ham and Gottlieb, Jour. Bact., 56, 1948, 107; Ehrlich, Gottlieb, Burkholder, Ander- son and Pridham, Jour. Bact., 56, 1948, 467.) ve.ne.zu.e'lae. M.L. noun Venezuela Venezuela; M.L. gen. noun venezuelae of Venezuela. Vegetative growth: Hj-phae colorless, monopodial branches, 0.9 to 1.8 microns in diameter. Aerial mycelium: Straight or slightly and irregularly curved, 1.0 to 1.8 microns in diameter, lavender under microscope, gray to light tan or pink without magnifica- tion. Spores ellipsoidal to oblong, 0.4 to 0.8 by 0.7 to 1.6 microns. Gelatin: Rapid liquefaction. Soluble dark pigment. Synthetic agar: Light lavender-colored growth. Starch agar: White to lavender growth. Glucose agar: Soluble dark pigment. Dorset's egg medium: White to gray growth. Loeffler's serum: Dark brown growth. Tyrosine agar: Reaction positive. Xylose, arabinose, rhamnose, d-glucose, d-mannose, d-fructose, d-galactose, cello- biose, starch, dextrin, glycerol, acetate, citrate, succinate and salicin support good growth. Slight or no growth with d-ribose, sucrose, raffinose, inulin, erythritol, dulci- tol, mannitol, sorbitol, inositol and malate. No growth with formate, oxalate, tartrate, salicylate, phenol, o-cresol, m-cresol or p- cresol. Milk: Peptonized. Soluble dark pigment. Potato: Abundant, gray growth. Nitrites produced from nitrates. Antagonistic properties: Produces chlor- amphenicol, a neutral compound active
