THE CLASSIFICATION OF BACTERIA 323 



30. Ps. fluorescens (Fliigge) Migula 



B. fluoresccns-liquefaciens Fliigge : Die Mikroorganismen, 1886, 289. 



B. viscosus Frankland : Zeitsch. f. Hygiene, VI, 1887, 39. 



B. fluorescens-mvalis Schmelck: Centralblatt f. Bakteriol., IV, 1888, 544. 



Morphology. Bacilli 0.5: 1.0-1.5 /*i occur chiefly in pairs. A polar bundle 

 of 3-6 flagella. Not stained by Gram's method. Cultural characters 

 like No. 28, but according to Lehmann and Neumann, milk is not coagu- 

 lated, and cultures show a weak indol reaction. 



Ruzicka (Archiv f. Hygiene, XXXIV, 1898, 149) shows that the present 

 species and No. 28 are subject to such variations in cultural characters 

 that no sharp lines between the two can be drawn. The student should 

 consult the above paper by Ruzicka. 



Habitat. Widely distributed, water, etc. 



31. Ps. rugosa Wright 



B. rugosus Wright : I.e., 438. 



Morphology. Bacilli of medium size, ends rounded, in pairs, chsfms, and fila- 

 ments. Flagella 1-4, polar. 



Gelatin colonies. In 3 days, 3-4 mm., translucent, grayish, slightly elevated, 

 irregular, sinuous, sharp, radiately rugose, with a smooth border. 



Gelatin slant. Growth .grayish green, dense, limited, delicately wrinkled, 

 reticulate; gelatin a faint green. Grow in acid gelatin. 



Agar slant. Growth translucent, somewhat limited, grayish grayish white, 

 with delicate wrinkles. The agar becomes greenish. 



Bouillon. Turbid, with a pellicle. 



Potato. Growth moist, glistening, brown. 



Litmus nam: Coagulated, acid. 



Glucose bouillon. No gas. Indol slight. Nitrates not reduced to nitrites. 

 No growth at 36. 



Habitat. Water. 



32. Ps. incognita (Wright) 



B. fluorescens-incognitus Wright : I.e., 436. 



Morphology. Bacilli of medium size, short, ends rounded, in pairs, chains, 



and filaments. A polar flagellum. 

 Gelatin colonies. Deep : round, oval, yellow brown, granular. Surface: in 2-3 



days, thin, translucent ; edge irregular wavy, coli-like ; microscopically, 



