FAMILY III. STREPTOMYCETACEAE 



823 



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. 



