FAMILY MICROCOCCACEAE 



239 



singly, in clumps, and occasionally in 

 fours. Occasionally cultures are found 

 that are motile with a single flagellum. 

 Otherwise non-motile. Gram-variable. 



Gelatin colonies: Small, circular, yel- 

 lowish to yellowish-brown, somewhat 

 serrate margin, granulated, sharply con- 

 toured. 



Gelatin stab: Yellow, wrinkled surface 

 growth with slow, crateriform lique- 

 faction. 



Agar colonies: Small, pale yellowish, 

 homogeneous, entire. 



Agar slant : Canary -yellow, somewhat 

 dry, wrinkled, raised, entire. 



Broth : Turbid with yellowish ring and 

 sediment. 



Litmus milk: Slightly acid, soft 

 coagulum formed, with slight reduction; 

 slowly peptonized. 



Potato: Slight, canary-yellow growth. 



Indole is not formed. 



Nitrites not produced from nitrates. 



Starch not hydrolyzed. 



Acid is generally formed from glucose 

 and lactose. Sucrose, glycerol and man- 

 nitol generally not fermented. 



Ammonium salts are utilized. 



Ammonia produced from peptone. 



Non-pathogenic. 



Aerobic. 



Optimum temperature 25°C. 



Source : Original source not given. 



Habitat : Found in skin gland secre- 

 tions, milk, dairy products, and dairy 

 utensils. 



5. Micrococcus candidus Cohn. 

 (Cohn, Beitr. z. Biol. d. Pflanzen, 1, 

 Heft 2, 1872, 160 ; Staphylococcus candidus 

 Holland, Jour. Bact., 5, 1920, 223.) From 

 Latin candidus, shining white. 



Spheres: 0.5 to 0.7 micron, occurring 

 singly. Non-motile. Gram-positive. 



Gelatin colonies : White, granular, with 

 irregular or entire margin. 



Gelatin stab: White surface growth. 

 Filiform. No liquefaction. 



Agar colonies: Punctiform, white, 

 smooth, entire, iridescent. 



Agar slant: Smooth, white, glistening, 

 iridescent. 



Broth: Turbid, with pellicle. 



Litmus milk : Slightly acid ; not coagu- 

 lated. 



Potato: Thick, porcelain white, 

 glistening. 



Indole not produced. 



Nitrites not produced from nitrates. 



Starch not hydrolyzed. 



Ammonia produced from peptone. 



Ammonium salts not utilized. 



Acid from glucose, sucrose, lactose 

 and glycerol. 



Non-pathogenic. 



Aerobic. 



Optimum temperature 25°C. 



Source : Originally appeared as white 

 colonies on cooked potato exposed to dust 

 contaminations. 



Habitat: Found in skin secretions, 

 milk and dairy products. 



6. Micrococcus conglomeratus Migula. 

 (Citronengelber Diplococcus, Bumm, 

 Der Mikroorganismen der gonorrhoischen 

 Schleimhauterkrankungen, 1 Aufl., 1S85, 

 17; Micrococcus citreus conglomeratus 

 Flligge, Die Mikroorganismen, 2 Aufl., 

 1886, 182; Diplococcus citreus conglomer- 

 atus Bumm, ibid., 2 Aufl., 1887; Neisseria 

 citrea TrevLsan, I generi e le specie delle 

 Batteriacee, Milan, 1889, 32; Mcrismo- 

 pcdia citreus conglomeratus Dyar, Ann, 

 N. Y. Acad. Sci., 8, 1895, 352; Migula, 

 Syst. d. Bakt., 2, 1900, 146; not Micro- 

 coccus conglomeratus Weichselbaum, 1887, 

 see Trevisan, loc. cit., 33; Micrococcus 

 citreus Winslow and Winslow, Systematic 

 Relationships of the Coccaceae, 1908, 

 218.) From Latin, conglomeratus, rolled 

 together, crowded. 



Spheres: 0.8 to 1.2 microns, occurring 

 singly, in pairs, in fours, and in large 

 clumps. Non-motile. Gram-variable. 



Gelatin colonies: Small, circular, yel- 

 low with radiate margin. 



Gelatin stab : Slow crateriform lique- 

 faction. 



