FAMILY BACTERIACEAE 



641 



Agar colonies: Small, white, with 

 erose margin. 



Agar slant: White, smooth, glistening, 

 somewhat luxuriant, the medium taking 

 on a wine red color. 



Broth: Turbid with white pellicle, the 

 medium slowly assuming a reddish tinge. 



Litmus milk: Acid, with slow coagula- 

 tion and reduction of the litmus. Be- 

 coming alkaline. 



Potato: A heavy, white, creamy layer, 

 which later becomes yellowish -brown. 



Indole not produced. 



Nitrites produced from nitrates. 



Aerobic, facultative. 



Optimum temperature 25°C. No 

 growth at 37°C. 



Habitat : Water. 



49. Bacterium rubidum (Eisenberg) 

 Chester. {Bacillus rubidus Eisenberg, 

 Bakt. Diag., 3 Aufl., 1891, 88; Bacterium 

 rubidus (sic) Chester, Ann. Rept. Del. 

 Col. Agr. Exp. Sta., 9, 1897, 107 and 115; 

 Serratia rubida Levine and Soppeland, 

 Iowa State Coll. Engineering Exp. Sta. 

 Bull. 77, 1926, 53.) From Latin rubidus, 

 red. 



Description fnmi Eisenberg (loc. cil.). 

 Levine and Soppeland (loc. cit.) found 

 an organism in buttermilk which they 

 identified as Serratia rubida. Their de- 

 scription is more complete than that 

 given by Eisenberg but differs from the 

 original in several respects. 



Rods : Medium size with rounded ends, 

 often in long chains. Motile. 



Gelatin colonies: Circular, finely gran- 

 ular, entire, with reddish center. Slow 

 growth. 



Gelatin stab: Liquefaction. Brown- 

 ish-red sediment. 



Agar colonies: Small, flat, smooth, 

 amorphous, entire, brownish-red. Slow 

 growth . 



Agar slant: Brownish-red streak. 

 Spreading over surface. 



Potato: Brownish -red growth. 



Blood serum liquefied, red pigment. 



Aerobic, facultative. 



Does not grow well at 37°C. 



Source: Water. 



50. Bacteritim latericeum (Adametz) 

 Lehmann and Neumann. (Bacillus la- 

 ter iceus Adametz, Die Bakterien der 

 Trink- und Nutzwiisser, Mitteil. der 

 oestrr. Versuchsanst. f. Brauerei u. 

 Malzerei in Wien, 1888, 50; Bacillus 

 erythraeus Trevisan, I generi e le specie 

 delle Batteriacee, 1889, 19; Bacterium 

 latericeum Lehmann and Neumann, 

 Bakt. Diag., 1 Aufi., 2, 1896, 258; Serratia 

 latericea Bergey et al., Manual, 1st ed., 

 1923, 94.) From Latin latericeus, brick. 



Rods: 0.5 to 0.7 by 1.0 to 1.3 microns. 

 Non-motile. Gram-negative. 



Gelatin colonies: Small, white, granu- 

 lar, with slightly irregular margin. 



Gelatin stab: A thin, dry, spreading, 

 cream -pink surface growth. No lique- 

 faction. 



Agar colonies: Dry, glistening, whit- 

 ish, with irregular margin. 



Agar slant: Brick-red, smooth, glis- 

 tening, butyrous. 



Broth: Thick pellicle; fluid clear. 



Litmus milk: Alkaline. 



Potato: Brick-red streak. 



No gas from carbohydrate media. 



Indole not produced. 



Nitrites produced from nitrates. 



Aerobic, facultative. 



Optimum temperature 25° to 30°C. 



Habitat: Water. 



51. Bacterium alginicum Waksman, 

 Carey and Allen. (Jour. Bact., 28, 1934, 

 213.) 



Rods short to almost spherical, 0.6 to 

 1.0 micron in diameter. Sluggishly 

 motile. Capsule-forming. Gram- 



negative. 



Alginic acid plate: White, finely 

 granulated colonies, with entire margin. 

 Does not clear up the turbiditj" in plate. 

 Odor formed, resembling that of old 

 potatoes. 



Alginic acid liquid medium: Thin 

 pellicle, weak alginase formation. 



Sea water gelatin : Thin growth 

 throughout gelatin stab, no liquefaction 

 in 7 days at 1S°C. 



Agar liquefaction: None. 



Sea water glucose broth: Uniform but 



