126 BACTERIOLOGY 



ACETIC FERMENT GROUP 

 10. Bact. aceti (Kiitz.) Lanzi, emend. Beijerinck 



Essig mutter Kiitzing : Jour, prakt. Chemie, XI, 1837, 385. 

 Utvina aceti Kiitzing: Phycologie generalis, 1843, 148. 

 Mycoderma aceti Pasteur : tude sur le Vinaigre, 1868, 106. 

 Bact. aceti Lanzi : N. Giorn. bot. Ital., 1876, 257. 

 Bact. aceti Beijerinck : Centralblatt f. Bakteriol., 2 Abt., IV, 1898. 



In beer gelatin containing 10 per cent of cane sugar, very voluminous colonies 

 of a slimy consistency, and causing a strong turbidity of the gelatin. 

 Grow poorly in beer gelatin without sugar ; cane sugar inverted. Beijerinck 

 holds this species to be distinct from B. aceti of Hansen. 



Habitat. The quick vinegar ferment of Pasteur, living on the surface of beech 

 wood shavings in the vinegar vats. 



11. Bact. Pasteurianum (Hansen) Zopf 



Mycoderma Pasteurianum Hansen : Compt. Rendu Carlsberg Lab., Copenhagen, 1879. 

 Bact. Pasteurianum Zopf: Spaltpilze, 1885, 64. 



Morphology. The membrane consists of chains of elements 0.4-0.8: 1.0 /x. 

 Wort gelatin colonies. Entire, without any rosette form, but with brain-like 



corrugations of the surface. 

 Sterile beer. In 24 hours, at 24 C, a rather thick dry membrane, minutely 



corrugated ; fluid clear. 

 Habitat. Beer and beer-wort, seldom in wine. 



12. Bact. Kiitzingianum (Hansen) 



Compt. Rendu Carlsberg Lab., Copenhagen, III, 1894, 265. 



Morphology. Short, thick bacilli ; not in chains as in No. II. 

 On sterile beer. A moist, smooth, slimy membrane, easily broken, with a 

 tendency to rise on the walls of the tube. 



13. Bact. Hansenianum 



Mycoderma aceti Hansen : I.e., 1879. 

 Bact. aceti Zopf: Spaltpilze, 1885, 62. 

 Bact. aceti Brown : Jour. Chem. Soc., I^ondon, XLIX, 1886. 



Morphology. Bacilli, short rods, rather more slender than No. n ; in chains, 

 placed parallel with often hour-glass forms long slender involution 

 forms irregularly swollen and often branched. 



Wort gelatin colonies. Rosette-like, radiate. 



