348 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



Agar slant: Small, gray, discrete 

 colonies. 



Glucose broth: Slight gray sediment. 



Litmus milk : Slightly acid with partial 

 reduction of litmus. 



Potato: No visible growth. 



Indole not formed. 



Nitrites not produced from nitrates. 



Grows poorly on ordinary media with- 

 out the addition of yeast extract or other 

 growth accessory substance. 



Acid from glucose, fructose, galactose 

 and lactose. Generally does not form 

 acid from mannose, sucrose, maltose, 

 xylose, arabinose, rhamnose, raffinose, 

 glycerol, dextrin, inulin, starch, salicin, 

 mannitol or sorbitol. 



Uses citric acid in milk. 



Aerobic, facultative. 



Optimum temperature 20° to 25°C. 



Distinctive character : Non-slime 

 producer. 



Source: Dairy products. 



Habitat: Found in milk and dairy 

 products. 



Appendix: This includes species that 

 probably belong in this genus. The de- 

 scriptions are too meager to permit draw- 

 ing any definite conclusion regarding 

 their relationship to the three species 

 recognized above. 



Bacterium laevolacticum Migula. 

 (Bacillus acidi laevolaciici Schardinger, 

 Monatsh. f. Chemie, 11, 1890, 544; 

 Migula, Syst. d. Bakt., 2, 1900, 406; 

 Bacterium acidi laevolactici Lehmann and 

 Neumann, Bakt. Diag., 4 Aufl., 2, 1907, 

 178.) From well water. 



Leuconostoc lagerheimii Ludwig. 

 (Ludwig, Lehrb. d. niederen Kryptog., 

 1892, 29; Streptococcus lagerheimii 

 Migula, Syst. d. Bakt., 2, 1900, 41.) 

 From slimy sugar solutions. 



Micrococcus gelatinogenus Briiutigam. 

 (Pharmaceutische Centralhalle, 1891, No. 

 30.) From the air. Forms gum in su- 

 crose media. 



Micrococcus gummosus Happ. (Inaug. 

 Diss., Basel, published in Berlin, 1893, 

 31.) From slimy sugar solutions. 



Myxococcus betae Gonnermann. 

 (Oesterr.- Ungar. Ztschr. f. Zuckerind. u. 

 Landw., 136, 1907, 883.) From sugar 

 beet juice. 



Streptococcus citrovorus-paracitrovorus 

 Vas and Csiszdr. (Milchwirtsch. 

 Fortsch., 18, 1936, 68.) From cream and 

 butter. 



Streptococcus hornensis Boekhout. 

 (Cent. f. Bakt., II Abt., 6, 1900, 162.) 

 From slimy, sweetened condensed milk. 

 A strong dextran former. Related to 

 Leuconostoc mesenteroides . 



Zoogloea termo Cohn. (Cohn, Nov. Act. 

 Acad. Caes. Leop. -Carol. Nat. Cur., 2■l^, 

 1854, 123.) The only species in the genus 

 Zoogloea as originally proposed. From 

 running water. Scheibler used this name 

 for a zoogloea-forming organism from 

 slimy sugar solutions in Neue Ztschr. f. 

 Riibenzucker- Ind., /, 1878, 366 and prob- 

 bably also in Ztschr. d. Vereins f . Riiben- 

 zucker- Ind., 1874, 330. The latter refer- 

 ence apparently is not available in 

 America. See Buchanan, General Syst. 

 Bact., 1925, 530 for a history of the 

 genus Zoogloea. 



