FAMILY BACTERIACEAE 



611 



Source: Air. 

 Habitat: Unknown. 



7. Flavobacteriinn acetylicum Levine 

 and Soppeland. (Bull. 77, Engineering 

 Exp. Sta., Iowa State Agricultural Col- 

 lege, 1926, 46.) From the chemical term 

 acetyl. 



Rods: 0.9 by 1.1 microns, with rounded 

 ends, occurring singly and in pairs. Mo- 

 tile. Gram-positive. 



Gelatin stab: Stratiform liquefaction. 



Agar colonies: Irregular in form, yel- 

 low, smooth, flat, amorphous, entire. 



Agar slant: Abundant, echinulate 

 growth, flat, peach yellow, smooth and 

 butyrous. 



Broth: Ring growth on surface. Tur- 

 bid with scant sediment. 



Litmus milk: Slight acidity, with 

 granular curd. Pej^tonization. Litmus 

 reduced. 



Potato: Moderate, orange growth. 



Indole not formed. 



Nitrites not produced from nitrates. 



Starch hydrolyzed. 



Blood serum liquefied. 



Acid from glucose with formation of 

 acetylmethylcarbinol . 



Aerobic, facultative. 



Optimum temperature 22 °C. 



Source: From skimmed milk. 



Habitat: Unknown. 



8. Flavobacterium fuscum (Zimmer- 

 mann) Bergey et al. (Bacillus fuscus 

 Zimmermann, Bakt. unserer Trink- und 

 Nutzwasser, Chemnitz, /, 1890, 70; not 

 Bacillus fuscus Fliigge, Die Mikro- 

 organismen, 2 Aufl., 1886, 290; Bacterium 

 fuscus Chester, Ann. Rept. Del. Col. 

 Agr. Exp. Sta., 9, 1897, 111; Bergey et al., 

 Manual, 1st ed., 1923, 113; Chromobac- 

 teriurn fuscum Topley and Wilson, Princ. 

 Bact. and Immun., 1, 1931, 405.) From 

 Latin /?/scws, tawny. 



Rods: 0.6 by 1.5 microns, occurring 

 singly. Xon -motile. Gram-positive. 



Gelatin colonies: Small, with brownish 

 center and yellowish border. 



Gelatin stab: Gray, filiform growth in 

 stab. Slow crateriform liquefaction. 



Agar colonies: Circular, pale yellow, 

 smooth, slightly convex, entire. 



Agar slant: Growth greenish-yellow, 

 plumose, smooth, raised, undulate. 



Broth: Turbid, with pellicle and sedi- 

 ment . 



Litmus milk: Slightly acid, becoming 

 alkaline, with yellow ring. 



Potato: Thick, moist, chrome-yellow 

 streak. 



Indole not formed. 



Nitrites produced from nitrates. 



Aerobic, facultative. 



Optimum temperature 30°C. 



Source: From Zwonitz River water. 



Habitat: Water. 



8a. Bacterium fuscum liquefuciens 

 (Dyar) Chester. {Bacillus fuscus lique- 

 faciens Dyar, Ann. N. Y. Acad. Sci., 8, 

 1895, 375; Chester, Ann. Rept. Del. Col. 

 Agr. Exp. Sta., 9, 1897, 108.) Received 

 from the Krai collection labeled Bacillus 

 fuscus; also from air. Differs from the 

 above only in liquefying gelatin more 

 slowly and completely. 



9. Flavobacterium maris Harrison. 

 (Canadian Jour. Research, 1, 1929, 232.) 

 From Latin mare, sea. 



Rods: 0.7 to 0.8 by 1.0 to 1.2 microns, 

 occurring singly and in pairs. At 37°C 

 coccoid. Non-motile. Encapsulated. 

 Gram-positive. 



Gelatin colonies: Punctiform, red- 

 orange, granular, entire. 



Gelatin stab: Red-orange surface 

 growth, filiform growth in stab. No 

 liquefaction. 



Agar colonies : Circular, orange-yellow, 

 smooth, glistening, convex. 



Agar slant : Growth moderate, orange- 

 yellow, becoming cadmium-orange to 

 red-orange, spreading, glistening. 



Broth: Clear with orange pellicle and 

 sediment. 



Litmus milk: At first faintly alkaline, 

 becoming faintly acid with orange sedi- 

 ment. 



Potato: Scant growth. 



