lon.gis'si.mus. L. sup. adj. longissimus longest, very long. Vegetative growth: Bright orange or gol- den red colonies. No diffusible pigment. Aerial mycelium: Weakly developed; ab- sent on some media. Sporophores straight, short, single or branched. Spores elongated, 0.7 by 1.0 to 1.3 microns, cylindrical. Gelatin: Rapid liquefaction. Synthetic agar: Well developed, velvety, white-yellow aerial mycelium. Potato: Well developed aerial mycelium of characteristic color. Starch is actively hydrolyzed. Good growth on cellulose. Paraffin and waxes support good growth. Antagonistic properties: Weakly antago- nistic. Relationships to other species: Similar to Strepiomyces fradiae. Source: Isolated from soil. Habitat: Soil. 87. Streptomyces olivaceus (Waks- man, 1923) Waksman and Henrici, 1948. (Actinomyces 206, Waksman, Soil Sci., 7, 1919, 117; Actinomyces olivaceus Waksman, in Manual, 1st ed., 1923, 354; Waksman and Henrici, in Manual, 6th ed., 1948, 950.) o.li.va'ce.us. L.noun oliva the olive; M.L. adj. olivaceus olive-colored. Aerial mycelium: Clumps small, with straight and branching hyphae. No spirals on most media. Conidia spherical and ellipsoidal, 0.9 to 1.1 by 0.9 to 2.0 microns. Gelatin stab: Liquefaction with cream- colored, flaky, yellow sediment. Agar: White, glistening growth. Synthetic agar: Growth abundant, spreading, developing deep into medium, yellow to olive -ochre, reverse yellow to almost black. Aerial mycelium mouse-gray to light drab. Starch agar: Thin, yellowish green, spreading growth. Glucose agar: Growth abundant, restric- ted, entire, center raised. Glucose broth: Sulfur-yellow ring. Litmus milk: Faint, pinkish growth; co- agulated; peptonized, becoming alkaline. Potato: Growth abundant, much wrin- kled, elevated, gray, turning sulfur-yellow on edge. The pigment formed is not soluble. Starch is hydrolyzed. Nitrites produced from nitrates. Aerobic. Optimum temperature, 25° C. Antagonistic properties: Positive. Source: Isolated from soil. Habitat: Soil. 88. Streptomyces microflavus (Krain- sky, 1914) Waksman and Henrici, 1948. (Actinomyces microflavus Krainsky, Cent. f. Bakt., II Abt., 41, 1914, 662; Waksman and Henrici, in Manual, 6th ed., 1948, 950.) micro. fla'vus. Gr. adj. micrus small; L. adj. flavus yellow; M. L. adj. microflaviis somewhat yellow. Aerial mycelium: Well developed, cot- tony, white. Spores spherical to rod-shaped, often in pairs or chains, 2.0 by 2.0 to 5.0 microns. Gelatin colonies: Small, yellow. Gelatin stab: Rapid liquefaction. Agar: Yellow colonies with rose-yellow aerial mycelium in 3 to 4 weeks. Ca-malate agar: Minute yellow colonies. No aerial mycelium. Glucose agar: A rose-yellow aerial my- celium develops in about 12 days. Starch agar: Same as on glucose agar. Glucose broth: Small spherical colonies in depth. Litmus milk : Rapidly coagulated and pep- tonized. Potato: Yellow growth. No aerial my- celium. Diastatic action strong. Scant growth on cellulose. Nitrites produced from nitrates. Aerobic. Optimum temperature, 25° C. Antagonistic properties: Positive. Source: Isolated from soil. Habitat: Soil. 89. Streptomyces cacaoi (Waksman, 1932) Waksman and Henrici, 1948. (Actino- myces cacaoi Waksman, in Bunting, Ann. Appl. Biol., 19, 1932, 515; Waksman and Henrici, in Manual, 6th ed., 1948, 951.) ca.ca'o.i. Mexican Spanish cacao the ca- cao tree; M.L. gen. noun cacaoi of cacao. Aerial mycelium: Long with considerable
