Aerial mycelium: Hj^phae long, sporulat- ing, producing no spirals, Spores ellipsoidal or spherical. Gelatin: Heavy, light to dark yellow sur- face growth. Aerial mycelium powdery, white. Soluble yellow-brown to deep brown pigment in liquefied portion. Strong lique- faction. Agar: Poor, shiny, golden yellow growth. Aerial mycelium thin, powdery. Soluble golden yellow pigment. Synthetic agar: Crumb-like, light yellow growth. Aerial mycelium powdery, white. Soluble golden yellow pigment. Glucose asparagine agar: Smooth, almost colorless to j^ellowish growth. Aerial my- celium powdery, white. Soluble faint yellow pigment. Ca-malate agar: Thin, smooth, colorless to faintly yellowish growth. Aerial my- celium powdery, grayish white. Starch agar: Thin, colorless growth. Aerial mycelium powdery, white. No soluble pigment. Glucose agar: Yellowish growth with tinge of orange. Aerial mycelium powdery, gray- ish white. Soluble light yellow to golden yellow pigment. Glucose broth: Heavy yellowish surface growth; submerged flakes yellowish. Soluble golden yellow pigment. Milk: Abundant, colorless growth with light yellow reverse. Aerial mycelium cottony, snow-white becoming yellowish. Actively peptonized. Slight acidity. Potato: Heavy, yellow growth becoming brownish yellow or orange. Aerial mycelium cottony white to yellowish white. Starch is actively hydrolyzed. Poor growth on cellulose. Antagonistic properties: Produces actino- mycin C (actinochrj^sin). Source: Isolated from soil. Habitat: Soil. 79. Streptomyces gougerotii (Duche, 1934) Waksman and Henrici, 1948. {Actino- myces gougeroti (sic) Duche, Encyclopedie Mycologique, Paris, 6, 1934, 272; Strep- tomyces gougeroti (sic) Waksman and Hen- rici, in Manual, 6th ed., 1948, 947.) gou.ge.ro'ti.i. M.L. gen. noun gougerotii of Gougerot; named for Prof. Gougerot, from whom the original culture was ob- tained. Aerial mycelium: Hyphae short, gnarled. Spores ellipsoidal. Gelatin: Heavy surface growth. Cream- colored colonies developing slowly with faint aerial mycelium; no pigment; lique- faction rapid. Agar: Cream-colored growth forming concentric rings with age, with brownish reverse; faint yellow soluble pigment. Aerial mycelium thin, white. Synthetic agar: Slow growth as puncti- form colonies; cream-colored with smooth edge; no aerial mycelium; no soluble pig- ment. Glucose agar: Colorless to yellowish growth. Aerial mycelium thin, white. No soluble pigment. Peptone broth: Cream-colored ring on surface of medium with flakes throughout the medium; no soluble pigment. Aerial mycelium white. Synthetic solution: Submerged mycelium in the form of flakes, later forming a surface pellicle; no soluble pigment. Tyrosine medium: Good growth with white aerial mycelium; no soluble pigment. Coagulated serum: Cream-colored growth covered with white aerial mycelium; rapid liquefaction of serum. Milk: Cream-colored surface growth. Aerial mycelium white, thin. Rapidly pep- tonized. Potato: Slow growth of a greenish tinge; Aerial mycelium thin, white. No soluble pigment. Starch is rapidly hydrolyzed. Nitrates not reduced. Antagonistic properties: Active against fungi. Relationships to other species: Inter- mediate between Streptomyces albus with its abundant aerial mycelium and Actinomyces almquistii with its very scant aerial my- celium. Source: Culture obtained from the col- lection of Prof. Gougerot. Habitat: Unknown. 80. Streptomyces farinosus (Krassilni- kov, 1941) Waksman, 1953. {Actinomyces farinosus Krassilnikov, Guide to the Ac-
