FAMILY BACTERIACEAE 



603 



Optimum temperature: Room tem- 

 perature. 



Pigment soluble in water. 



Distinctive characters: Morphologi- 

 cally like the anthrax bacillus. Appear- 

 ance in gelatin. Production of a 

 brilliant rose color when grown in the 

 dark; colonies grown in the light are 

 white, but they assume the red color if 

 developed further in the dark. 



Source: Isolated from Wiesbaden soil 

 by Scholl. 



Habitat: Unknown. 



Note: It has been claimed that this 

 or a similar organism forms spores 

 (Matzuschita, Bact. Diag., 1902, 168; 

 Perlberger, Cent. f. Bakt., II Abt., 62, 

 1924, 8). However cultures of Scholl's 

 organism received from the Krai collec- 

 tion by Hefferan (Cent, f . Bakt., II Abt., 

 11, 1903, 458) and by Breed in 1926 (per- 

 sonal communication) did not form 

 spores. These cultures produced ni- 

 trites from nitrates and failed to liquefy 

 gelatin. 



5. Bacterium mutabile Steinhaus. 

 (Jour. Bact., 42, 1941, 775.) From Latin 

 mutabilis, changeable. 



Short rods: On agar, 0.7 to 0.9 by 1.0 

 to 2.0 microns. In fluid media, such as 

 tryptophane broth, pleomorphic, bi- 

 zarre forms frequently appearing slightly 

 branched. Non -motile. Gram-posi- 

 tive. 



Gelatin stab: Very slow liquefaction. 



Agar colonies: Cream to yellow, cir- 

 cular, smooth, glistening, opaque. 



Broth : Moderate turbidity, slight sedi- 

 ment. 



Litmus milk: Alkaline, soft curd, slow 

 peptonization. 



Indole not produced. 



Hydrogen sulfide not produced. 



Nitrites produced from nitrates. 



Starch not hydrolyzed. 



Glucose, lactose, sucrose and maltose 

 not fermented. 



Aerobic. 



Source: From the alimentary tract of 



the lyreman cicada, Tibicen linnei 

 Smith and Grossbeck. 

 Habitat: Unknown. 



6. Bacterium qualis Steinhaus. (Jour. 

 Bact., 42, 1941, 774.) From Latin 

 qualis, of what kind. 



Short rods: Very short on solid media, 

 frequently ellipsoidal in shape. In fluid 

 media: 0.5 to 0.7 by 1.4 to 2.2 microns, 

 occurring singly. Non-motile. Gram- 

 positive. 



Gelatin stab: Liquefaction. 



Agar colonies: Small (1 mm), white, 

 glistening, transparent, circular, entire. 



Agar slant: Filiform, smooth, glis- 

 tening. 



Broth: Almost clear; slight turbidity 

 in serum and glucose broth. 



Litmus milk: No change. 



Indole not produced. 



Hydrogen sulfide not produced. 



Slight production of nitrites from ni- 

 trates. 



Starch not hydrolyzed. 



Acid from glucose, sucrose and mal- 

 tose. Lactose not fermented. 



Source: From the alimentary tract of 

 the tarnished plant bug, Lygus praten- 

 sis L. 



Habitat: Unknown. 



7. Bacterium racemosum Zettnow. 

 (Zettnow, Cent. f. Bakt., I Abt., Orig., 

 77, 1915, 209; Zetlnowia racemosa Ender- 

 lein, Bakt. Cyclogenie, Berlin, 1925,259; 

 Flavobacterium racemosum Bergey et al.. 

 Manual, 1st ed., 1923, 115.) From Latin 

 race7iwsus, branching. 



Filaments: 0.5 to 0.8 by 10 to 12 mi- 

 crons. Branching forms found. Non- 

 motile. Gram-positive. 



Gelatin colonies: White, circular, soft, 

 granular, brownish, entire. 



Gelatin stab: White surface growth. 

 Liquefaction napiform. 



Agar slant: Light yellow, limited 

 growth. 



Broth: Turbid. 



