FAMILY III. STREPTOMYCETACEAE 



795 



Litmus milk: Pinkish ring; coagulated; 

 peptonized with distinctly alkaline reaction. 



Potato: Abundant growth, much wrin- 

 kled, greenish, becoming black with yellow- 

 ish margin. 



Soluble brown pigment formed. 



Starch is hydrolyzed. 



Nitrites produced in slight amounts from 

 nitrates. 



Aerobic. 



Optimum temperature, 25° C. 



Antagonistic properties: Positive; some 

 strains show no activity. 



Source: Isolated from soil. 



Habitat: Soil. 



94. Streptoniyces glaucus (Lehmann 

 and Schutze, 1912, emend. Krassilnikov, 

 1941) Waksman, 1953. {Actinomyces glaucus 

 Lehmann and Schutze, in Lehmann and 

 Neumann, Bakt. Diag., 5 Aufl., 2, 1912, 641; 

 Krassilnikov, Guide to the Actinomycetes, 

 Izd. Akad. Nauk, U.S.S.R., Moskau, 1941, 

 46; Waksman, in Waksman and Lechevalier, 

 Actinomycetes and Their Antibiotics, Balti- 

 more, 1953, 9L) 



glau'cus. Gr. adj. glaucus bright bluish 

 green or gray. 



Aerial mycelium: Well developed, cot- 

 tony, at first white then turning green, simi- 

 lar to green Penicillia. Sporophores form 

 compact spirals with 3 to 5 turns. Spores 

 ellipsoidal to spherical, 1.0 by 0.8 microns. 



Gelatin: Slow liquefaction. 



Agar: Heavy growth covered with green 

 aerial mycelium. 



Synthetic agar: Colorless growth. Soluble 

 brown pigment. 



Milk: Slowly peptonized, with prior co- 

 agulation by some strains. 



Potato: Heavy growth, covered with vel- 

 vety, green aerial mycelium. 



Sucrose weakly inverted. 



Starch is actively hydrolyzed. 



Good growth on cellulose. 



Paraffin: Good growth. 



Nitrites produced from nitrates. 



Antagonistic properties: All strains 

 strongly antagonistic. 



Source: Isolated from soil. 



Habitat: Soil. 



95. Streptoniyces rutgersensis (Waks- 



man and Curtis, 1916) Waksman and Hen- 

 rici, 1948. {Actinomyces rutgersensis Waks- 

 man and Curtis, Soil Sci., 1, 1916, 123; 

 Waksman and Henrici, in Manual, 6th ed., 

 1948, 952.) 



rut.ger.sen'sis. M.L. adj. rutgersensis 

 pertaining to Rutgers; named for Rutgers 

 University, New Brunswick, New Jersey. 



Aerial mycelium: Branching filaments 

 with abundant open and closed spirals; 

 hyphae fine, long, branching. Conidia 

 spherical and ellipsoidal, 1.0 to 1.2 microns, 

 with tendency to bipolar staining. 



Gelatin stab: Cream-colored, spreading 

 surface growth. Liquefied. 



Agar: Thin, wrinkled, cream-colored 

 growth. 



Synthetic agar: Growth thin, colorless, 

 spreading, becoming brownish to almost 

 black. Aerial mycelium thin, white, becom- 

 ing dull gray. 



Starch agar: Gray, spreading growth. 



Glucose agar: Abundant, brown myce- 

 lium, becoming black with cream-colored 

 margin. 



Litmus milk: Cream-colored ring; coagu- 

 lated; slow peptonization, becoming alka- 

 line. 



Potato: Abundant, white-gray, much 

 folded growth. 



The pigment formed is not soluble. 



Starch is hydrolyzed. 



Nitrites produced from nitrates. 



Aerobic. 



Optimum temperature, 37° C. 



Antagonistic properties: Limited. 



Source: Isolated many times from a 

 variety of soils. 



Habitat: Common in soil, 



96. Streptoniyces halstedii (Waksman 

 and Curtis, 1916) Waksman and Henrici, 

 1948. {Actinomyces halstedii Waksman and 

 Curtis, Soil Sci., 1, 1916, 124; Waksman and 

 Henrici, in Manual, 6th ed., 1948, 953.) 



hal.ste'di.i. M.L. gen. noun halstedii of 

 Halsted; named after Prof. Halsted of Rut- 

 gers University. 



Aerial mycelium: Branching mycelium; 

 hyphae with close spirals. Conidia ellip- 

 soidal or rod-shaped, 1.0 to 1.2 by 1.2 to 1.8 

 microns. 



