Jour. Antibiotics (Japanese), 5, 1952, 529 and 313.) ta.na.shi.en'sis. M.L. adj. tanashiensis pertaining to Tanash; named for Tanash, a place near Cairo, Egypt. Aerial mycelium: Hyphae almost straight; lightly open spirals. Spores spherical to ellipsoidal, 1.0 by 1.2 microns. Gelatin: Brown pigment. Rapid lique- faction. Synthetic agar: Grayish yellow growth. Aerial mjcelium white-gray turning brown- ish gray. Soluble, light yellow pigment. Milk: Yellowish surface ring. Coagulated and peptonized. Potato: Brown growth. Aerial mycelium dark gray to whitish gray. Soluble dark brown pigment. Starch is hydrolyzed. Carbon sources: Starch most suitable, followed by glycerol. Nitrogen sources: Peptone and meat ex- tract best. Tyrosinase reaction: Positive. Nitrites not produced from nitrates. Optimum pH, between 5.8 and 6.5. Antagonistic properties: Produces luteo- mycin. Relationships to other species : Resembles Streptomyces mireus and Streptomyces anti- bioticus. Source: Isolated from soil. Habitat: Soil. 58. Streptomyces erythroehromo- genes (Krainsky, 1914) Waksman and Hen- rici, 1948. {Actinomyces erythrochro?nogenes Krainsky, Cent. f. Bakt., II Abt., 41, 1914, 662; also see Waksman and Curtis, Soil Sci., 1, 1916, 112; Waksman and Henrici, in Manual, 6th ed., 1948, 944.) e.ry.thro.chro.mo'ge.nes. Gr. adj. cry- thrus red; Gr. noun chromus color; Gr. v. sufHx -genes producing; M.L. adj. erythro- chromogenes producing red color. Aerial mycelium: Conidia ellipsoidal, about 2.0 microns long. Gelatin colonies: Slow growth. Gelatin stab: Liquefied. A soluble brown pigment formed. Agar: Brown soluble pigment. White aerial mycelium. Ca-malate agar: Colonies circular, with grayish white margined aerial mycelium. Glucose agar: Red pigment formed. Starch agar: A soluble rose pigment on old cultures. Glucose broth: Abundant growth. Float- ing colonies, later a pellicle is formed. Brown soluble pigment. Potato: Gray aerial mycelium. Medium colored black. Weakly diastatic. No growth in cellulose. No proteolytic enzyme formed. Nitrates show slight reduction. Aerobic. Optimum temperature, 30° C. Antagonistic properties: Active against various bacteria. Source : Isolated from soil and from roots of Alnus (alder). Habitat: Soil. 59. Streptomyces collinus Lindenbein, 1952. (Arch. f. MikrobioL, 17, 1952, 380.) col.li'nus. L. adj. collinus hilly, mounded. Aerial mycelium: Produces spirals. Abun- dant sedimentation producing ellipsoidal spores. Gelatin: Dark brown growth. No aerial mycelium. Soluble dark brown pigment. Rapid liquefaction. Agar: Crumb-like, dark brown growth. Aerial mycelium powdery gray-white. Solu- ble dark brown pigment. Synthetic agar: Crumb-like growth with light brown to red-brown reverse. Aerial mycelium chalk-white. Soluble yellow- brown pigment, later becoming reddish brown. Glucose asparagine agar: Crumb-like growth with reverse irregularly brown- purple to brown-yellow. Aerial mycelium chalk-white, later becoming ash-gray. Solu- ble carmine-red pigment, later brown-red. Ca-malate agar: Crumb-like growth with yellow-brown to red reverse. Aerial myce- lium velvety chalk-white. Soluble yellow- brown pigment. Starch agar: Large, reddish colonies with reddish yellow reverse. Aerial mycelium velvety chalk-white. Glucose agar: Good growth with yellow-
