THE CLASSIFICATION OF BACTERIA 325 



35. Ps. striata (Ravenel) 



B. striatus-viridis Ravenel : I.e., 22. 



Morphology . Bacilli slender, of variable lengths ; rods irregular ; stain like 

 diphtheria ; occur singly and in pairs. Flagella polar. 



Gelatin colonies. Deep : round, yellowish, granular, entire, becoming brown- 

 ish. Surface: in 5 days 1 mm., zoned; border filamentous. 



Agar slant. Growth thin ; agar becomes slightly green yellowish green. 



Gelatin stab. Slight growth in depth ; on the surface, growth white, elevated. 



Potato. Growth moist, glistening, becoming chocolate-brown. 



Bouillon. Turbid; becoming in 7 days slightly greenish. 



Pepton rosolic acid. Unchanged. 



Litmus milk. Alkaline, becoming decolorized. 



Glucose bouillon. No gas. Indol negative. 



Habitat. Soil. 



36. Ps. ovalis (Ravenel) 



B . fluorescens-ovalis Ravenel; I.e., 9. 



Morphology. Bacilli short, rounded, 2-3 times their breadth ; occur singly. 



Flagella polar. 

 Gelatin colonies. Deep: pale gray, slightly granular, entire. Surface: round, 



light gray, slightly granular, entire, becoming blue white yellowish 



green. 

 Gelatin stab. In depth, growth filiform ; on the surface, a white button, with 



irregular leafy margins. 

 Agar slant. Growth thin, greenish white, limited ; the agar becomes a faint 



green. 

 Potato. Growth thin, moist, honey-yellow, becoming yellowish brown. 

 Bouillon. Turbid, a flaky pellicle on the surface ; the medium has a greenish 



tint. 

 Litmus milk. Deep blue, alkaline. 

 Glucose bouillon. No gas. Indol negative. 

 Habitat. Soil. 



37. Ps. convexa (Wright) 



B . fluorescens-convexus Wright : I.e., 438. 



Morphology. Bacilli of medium size, short, thick, rounded. A polar flagellum. 

 Gelatin colonies. Deep-, round, sharp, slightly granular. Surface: round, 



convex, glistening, light greenish, translucent ; the gelatin acquires a blue 



green fluorescence. 



