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.
