238 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



teriacee, Milan, 1889, 31 ; Urococcus 

 ureae Beijerinck, Cent. f. Bakt., II Abt., 

 7, 1901, 52; Albococcus ureae Kligler, Jour. 

 Infect. Dis., 13, 1943, 442; Staphylococcus 

 wreae Holland, Jour. Bact., 5, 1920, 225.) 

 From Greek, urum, urine; M. L., urea, 

 urea. 



See Micrococcus liquefaciens Migula 

 in the appendix for references to the 

 gelatin-liquefying form of the species. 



Spheres: 0.8 to 1.0 micron, occurring 

 singly, in pairs and in clumps. Never in 

 chains. Non-motile. Gram-variable. 



Gelatin colonies : Small, white, translu- 

 cent, slimy, becoming fissured. 



Gelatin stab: Slight, white growth. 

 Very slow or no liquefaction. 



Agar colonies: White, slightly raised. 



Agar slant: Grayish -white, raised, 

 glistening, butyrous. 



Broth: Turbid, with viscid sediment. 



Litmus milk : Slightly alkaline ; litmus 

 slowly reduced. 



Milk: Acid. 



Potato: Slight, grayish to pale olive 

 growth. 



Indole not formed. 



Nitrites not produced from nitrates. 



Urea fermented to ammonium car- 

 bonate. 



Acid produced from glucose, lactose, 

 sucrose and mannitol. 



Starch not hydrolyzed. 



Ammonium salts are utilized. 



Ammonia produced from peptone. 



Saprophytic. 



Aerobic. 



Optimum temperature 25°C. 



Source : Isolated from fermenting urine. 



Habitat : Found in stale urine and in 

 soil containing urine. 



Sternberg, Man. of Bact., 1893, 601; 

 Micrococcus acidilactis Migula, Syst. d. 

 Bakt., 2, 1900, 112; Micrococcus acidifi- 

 cans Migula, ibid.); Micrococcus lactis 

 viscosus Sternberg, Man. of Bact., 1893, 

 604; Micrococcus amarijaciens Migula, 

 Syst. d. Bakt., 2, 1900, 100; Coccus lactis 

 viscosi Gruber, Cent. f. Bakt., II Abt., 

 9, 1902, 790 {Micrococcus lactis viscosi 

 Lohnis, Cent. f. Bakt., II Abt., 18, 1907, 

 144) ; Micrococcus lactis albidus Conn, 

 Esten and Stocking, Storrs Agr. Exp. 

 Sta. 18th Ann. Rept., 1906, 91. 



Spheres: 2.0 microns in diameter, oc- 

 curing singly and in clumps, rarely in 

 short chains. Non-motile. Gram-posi- 

 tive. 



Milk gelatin colonies: Small, white, 

 opaque. 



Milk gelatin stab : Inf undibuliform 

 liquefaction. 



Agar colonies: White, slimy. 



Agar streak: White, smooth. 



Broth : Turbid, with white sediment. 



Litmus milk: Acid; coagulated; pep- 

 tonized. 



Potato: Moderate white to yellow 

 streak. 



Indole not formed. 



Nitrites not produced from nitrates. 



Starch not hydrolyzed. 



Ammonia produced from peptone. 



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. 



Saprophytic. 



Aerobic. 



Optimum temperature 20°C. 



Habitat : Milk and dairy utensils. 



3. Micrococcus freudenreichii Guille- 

 beau. (Landwirtsch. Jahrb. d. Schweiz, 

 5, 1891, 135.) Named for E. v. Freuden- 

 reich, Swiss bacteriologist. 



Synonyms: Micrococcus acidi lactis 

 Krueger, Cent. f. Bakt., 7, 1890, 464 

 {Micrococcus acidi lactis liquefaciens 

 Eisenberg, Bakt. Diag., 3 Aufl., 1891, 

 409 ; Micrococcus acidi lactici liquefaciens 



4. Micrococcus flavus Trevisan. {Mi- 

 crococcus flavus liquefaciens Fliigge, Die 

 Mikroorganismen, 2 Aufl., 1886, 174; 

 Trevisan, I generi e le specie delle Bat- 

 teriacee, Milan, 1889, 34; Micrococcus 

 flavus-liquefaciens Chester, Man. De- 

 term. Bact., 1901, 99.) From Latin, 

 flavus, yellow. 



Spheres: 0.8 to 0.9 micron, occurring 



