tvveen 30° and 35° C. Thermal death point of mycelium, 70° C. in 2 to 5 minutes. Spores resist 80° C. for 1 to 5 minutes. Source : Isolated from the air. Habitat: Found in soil, lake mud and other substrates. 2. Micromonospora fusca Jensen, 1932. (Proc. Linn. Soc. New So. Wales, 57, 1932, 178.) fus'ca. L. adj. fuscus dark, tawny. Vegetative growth: On glucose-aspara- gine agar, heavy, compact, orange, rapidly changing to deep brown and nearly black. Deep brown soluble pigment. Aerial growth: Moist, glistening, grayish to brownish black spore layer. Gelatin: Weak liquefaction. Soluble pig- ment very slight. Grows in liquid media as small, brown granules and flakes. Milk: Slowly digested; not coagulated; slight grayish brown discoloration. Sucrose is inverted. Starch is hydrolyzed. Cellulose is attacked to a slight extent. Nitrate reduction variable. Aerobic. Antagonistic properties: Produces micro- monosporin. Source: Isolated from soil. Habitat: Found in soil. 3. Micromonospora parva Jensen, 1932. (Proc. Linn. Soc. New So. Wales, 57, 1932, 177.) par'va. L. adj. parvus small. Vegetative growth: Scant growth on glu- cose -asparagine agar; vegetative mycelium thin, spreading widely into the agar, almost colorle.ss to pale pink or orange. Aerial growth: Sporulation scant, giving rise to thin, grayish, moist crusts on the surface. Spores ellipsoidal, occurring in a gray-colored mass. Gelatin: Liquefaction. Milk: Unchanged; maj^ be coagulated then slowly redissolved with a faintly acid reaction. Sucro.se not inverted. Starch is hydrolyzed. Cellulose not decomposed. Nitrites not produced from nitrates. Aerobic. Source: Isolated from soil. Habitat: Found in soil. 4. Micromonospora globosa Krassil- nikov, 1938. (Ray Fungi and Related Organ- isms. Izd. Akad. Nauk, U.S.S.R., Moskau, 1938, 134; also see Microbiology, U.S.S.R., 8, 1939, 179.) glo.bo'sa. L. adj. globosus spherical, glo- bose. Vegetative growth: Rugose, at first very compact, later acquiring a pasty consis- tency, adhering but slightly to the medium. The color of the cultures varies from light yellow to orange-red. During fruit-bearing, the colonies are covered with a brownish black tarnish of conidia. Aerial growth: Conidia are formed at the ends of short branches, one on each branch. Individual branches with conidia resemble grape vines. The conidia are spherical, 1.0 to 1.3 microns; they arise by the swelling of the branch tips. The swellings become round, acquire the shape of spheres which, as the formation of the conidia proceeds, are divided from the branch by a transverse septum. Gelatin: Liquefaction. Milk: Coagulated, peptonized. Sucrose is inverted. Starch is hydrolyzed. Cellulose not decomposed. Nitrites produced from nitrates. Aerobic. Source: Isolated from soil. Habitat: Soil. 5. Micromonospora coerulea Jensen, 1932. (Proc. Linn. Soc. New So. Wales, 57, 1932, 177.) coe.ru'le.a. L. adj. coeruleus dark blue, azure. Vegetative growth: Slow growth on glu- cose-asparagine agar. Mycelium dense, greenish blue. Insoluble pigment. Colonies pigmented only on free admission of oxygen. Surface of colonies hard and glossy. Aerial growth: Thin, white veil on surface resembling aerial mycelium but without aerial spores.
