458 



ORDER IV. EUBACTERIALES 



Litmus milk: Acid; coagulated; pep- 

 tonized. 



Potato: Moderate, white to yellow 

 growth. 



Indole not produced. 



Does not utilize urea as a source of ni- 

 trogen. 



Acid from glucose, lactose and sucrose. 

 Some strains form acid from mannitol, others 

 from glycerol. 



Starch not hydrolyzed. 



Nitrites not produced from nitrates. 



Ammonia produced from peptone. 



Ammonium salts are utilized. 



Saprophytic. 



Aerobic. 



Optimum temperature, 20° C. 



Habitat: Found in milk and dairy uten- 

 sils. 



4. Micrococcus flavus Trevisan, 1889. 

 {Micrococcus flavus liquefaciens Fliigge, Die 

 Mikroorganismen, 2 Aufl., 1886, 174; Trevi- 

 san, I generi e le specie delle Batteriacee, 

 Milan, 1889, 34.) 



fla'vus. L. adj. flavus yellow. 



Spheres, 0.8 to 0.9 micron in diameter, oc- 

 curring singly, in clumps and occasionally in 

 fours. Occasionally cultures are found that 

 are motile with a single flagellum, otherwise 

 they are non-motile. Gram-variable. 



Gelatin colonies: Small, circular, yellow- 

 ish to yellowish brown, somewhat serrate 

 margin, granulated, sharply contoured. 



Gelatin stab: Yellow, wrinkled surface 

 growth with slow, crateriform liquefaction. 



Agar colonies: Small, pale yellowish, 

 homogeneous, entire. 



Agar-slant: Growth canary-yellow, some- 

 what dry, wrinkled, raised, entire. 



Broth: Turbid with yellowish ring and 

 sediment. 



Litmus milk: Slightly acid; soft coagulum 

 formed with slight reduction; slowly pep- 

 tonized. 



Potato: Slight, canary-yellow growth. 



Indole not produced. 



Acid is generally formed from glucose and 

 lactose. Sucrose, glycerol and mannitol 

 generally not fermented. 



Starch not hydrolyzed. 



Nitrites not produced from nitrates. 



Generally produces growth on NH4H2PO4 

 media. 



Ammonia produced from peptone. 



Non-pathogenic. 



Aerobic. 



Optimum temperature, 25° C. 



Source: Original source not given. 



Habitat: Found in skin gland secretions, 

 milk, dairy products and dairy utensils. 



5. Micrococcus candidus Cohn, 1872. 

 (Beitrage z. Biol. d. Pflanzen, 1, Heft 2, 

 1872, 160.) 



can'di.dus. L. adj. candidus shining 

 white. 



Spheres 0.5 to 0.7 micron in diameter, 

 occurring singly. Non-motile. Gram-posi- 

 tive. 



Gelatin colonies: White, granular, with 

 irregular or entire margin. 



Gelatin stab: White surface growth. Fili- 

 form. No liquefaction. 



Agar colonies : Punctiform, white, smooth, 

 entire, iridescent. 



Agar slant: Smooth, white, glistening, 

 iridescent growth. 



Broth: Turbid with pellicle. 



Litmus milk: Slightly acid; not coagu- 

 lated. 



Potato: Thick, porcelain-white, glisten- 

 ing growth. 



Indole not produced. 



Acid from glucose, sucrose, lactose and 

 glycerol. 



Starch not hydrolyzed. 



Nitrites not produced from nitrates. 



Ammonia produced from peptone. 



Ammonium salts not utilized. 



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 cryophilus McLean et 

 al., 1951. (McLean, Sulzbacher and Mudd, 

 Jour. Bact., 6B, 1951, 723.) 



cry.o'phi.lus. Gr. noun cryus cold, frost; 



