198 IMPORTANT VARIETIES OF FISSION-FUNGL 



[a) Culture pale grayish-orange (cream). Bact. cremoides, 



L. and N., i page 267. 

 ((3) Growth lemon-yellow. Bact. luteum (Fl.), L. and N., 



page 268. 



2. Gelatin slowly liquefied. 



(a) Luxuriant lemon-yellow layer on gelatin. Agar and 



gelatin colored red. Bact. erythrogenes (Groten- 



felt), L. andN., page 268. 

 (;3) Eather abundant lemon-yellow growth on gelatin. 



Agar and gelatin colorless. Bact. helvolum (Zimm.), 



L. andN., page 268. 

 ( ) ) Growth on gelatin at first white, then yellowish. Milk 



slimy. Soapy smell. Bact. lactis saponacei, Weig- 



mann, page 269. 



3. Gelatin rapidly liquefied. Growth upon gelatin very del- 



icate. Little chromogenesis. Bact. nubilum (Frank- 

 land), L. and N., page 269. 

 (6) Spontaneous motility from polar flagellum. Gelatin lique- 

 fied, pale ooher-j^ellow sediment. Upon potato and agar, a 

 pale ocher-j'ellow deposit. Bact. ochraceum (Zimm.), L. 

 and N., page 270. 

 (C) Short rods to long threads. Cultures grayish-orange to pale 

 orange and brick-red. Never branches in the stab. 

 {a) Non-motile. Bact. fulvum (Zimmermann) , L. and N., page 



270. 

 (J) Motile. Bact. chrysoglcea Zopf., page 272. 



III. Formation of a rose-red to a brown-red pigment upon agar and 

 gelatin. Especially beautiful chromogenesis npon potato. (For red-brown 

 and briel'-red varieties, compare also Bact. fuscum and chrysoglcea.) 



(A ) Stains by Gram's method. Non-motile. Gelatin not lique- 

 fied. Bact. latericium (Adametz), L. and N., page 272. 



(B) Does not stain by Gram's method. Motile. Gelatin lique- 

 fied. Pigment rose to carmine-red, more rarely reddish- 

 yellow. Bact. prodigiosum (Ehrenberg), L. and N., page 

 272. 



IV. Formation of a non-diffusible, violet or bltie pigment in the cultures 

 upon agar, gelatin, and potato. 



(A) Gelatin more or less rapidly liquefied. Forms a deep violet 

 pigment, which is soluble in alcohol. Bact. violaceum, 

 Schroter, page 277. 



(B) Gelatin not liquefied. Pigment pale to deep indigo-blue, 

 insoluble. Bact. indigonaceum (Claessen), L. and N., page 

 280. 



(C) Gelatin slowly liquefied. Bluish-green, insoluble pigment, 

 especially marked on potato. Bact. cseruleum (Voges.), L. 

 and N., page 2^0. 



V. The growths of the bacteria are colorless or only slightly yellowish, 

 bluish, brownish, or greenish in color; on the contrary, a yellowish-green to 



' For relatives and synonyms, see the text. 



