FAMILY I. CYTOPHAGACEAE 



861 



7. Cytophaga deprimata Fuller and 

 Norman, 1943. (Jour. Bact., 45, 1943, 566.) 



de.pri.ma'ta. L. part. adj. deprimatus 

 depressed. 



Rod, long and flexuous with pointed 

 ends, 0.3 to 0.5 by 5.5 to 10 microns, ar- 

 ranged singly. Creeping motility on solid 

 surfaces. Gram-negative. 



Growth on starch agar is at first smoky 

 to faint yellow becoming bright yellow later. 

 Colonies are irregular and concave in eleva- 

 tion. The edge spreads indistinguishably 

 into the surrounding medium, and shallow 

 depressions develop around the colony. 

 Small colonies give the plate a characteristic 

 pitted appearance. 



Growth on cellulose dextrin agar is milky 

 white. Colonies are depressed in medium. 



Gelatin is liquefied in 4 days. 



Glucose, lactose, maltose, sucrose, pec- 

 tin, starch, cellulose dextrin and hemicellu- 

 lose are utilized. Very scant growth on cellu- 

 lose may be found on first isolation. 



Yeast extract, ammonium nitrate and 

 peptone are suitable nitrogen sources. 



Indole not produced. 



Nitrites not produced from nitrates. 



No visible change in litmus milk. 



Highly aerobic. 



Optimum temperature, between 25° and 

 30° C. 



Source: Isolated from soil. 



Habitat: Soil. Decomposes organic mat- 

 ter. 



8. Cytophaga albogilva Fuller and 

 Norman, 1943. (Jour. Bact., 45, 1943, 566.) 



al.bo.gil'va. L. adj. albogilvus whitish 

 yellow. 



Long flexuous rods with pointed ends, 

 0.3 to 0.5 by 4.5 to 7.5 microns, arranged 

 singly. Creeping motility on solid surfaces. 

 Gram-negative. 



Growth on starch agar is cream to pale 

 yellow. Colonies are small, concave and 

 irregularly round. Edge is entire and ir- 

 regular. 



Growth on cellulose dextrin agar is re- 

 stricted. Colonies are pin-point, milky white 

 in color, round and concave. 



Gelatin is liquefied in 7 days. 



Glucose, galactose, lactose, maltose, su- 

 crose, gum arable, pectin, starch, cellulose. 



dextrin and hemicellulose are utilized. Very 

 scant growth on cellulose may be found on 

 first isolation. 



Ammonia, nitrate and peptone are suit- 

 able nitrogen sources. 



Indole not produced. 



Nitrites not produced from nitrates. 



No visible change in litmus milk. 



Highly aerobic. 



Optimum temperature, between 22° and 

 30° C. 



Source: Isolated from soil. 



Habitat : Soil. Decomposes organic matter. 



9. Cytophaga krzemieniewskae Stan- 

 ier, 1940. (Incorrectly spelled Cytophaga 

 krzemieniewskii in Stanier, Jour. Bact., 40, 

 1940, 623; Jour. Bact., 42, 1941, 532.) 



krze.mi.en.i.ew'skae. M.L. gen. noun 

 krzemieniewskae of Krzemieniewska; named 

 for Helena Krzemieniewska. 



Long, flexible rods, usually of even width 

 with blunt ends, occasionally somewhat 

 pointed and spindle-shaped, 0.5 to 1.5 by 5 

 to 20 microns. Star-shaped aggregates occur 

 in liquid media. Creeping motility on solid 

 surfaces, non-motile in liquids. 



Growth on a sea-water-peptone agar 

 plate begins as a smooth, thin, pale pink, 

 rapidly spreading swarm. After a few days, 

 the older portions of the swarm assume a 

 warty appearance, due to the accumulation 

 of cells in drop-like masses, resembling im- 

 mature fruiting bodies but always contain- 

 ing normal vegetative cells. A diff'usible 

 brown to black pigment which masks the 

 pink color of the swarm is produced after 

 about a week. Agar is rapidly decomposed, 

 and ultimately liquefaction becomes al- 

 most complete. 



Sea-water-gelatin stab: Liquefaction. 



Growth in liquid media is turbid and silky 

 with a pink sediment; the medium turns 

 dark brown or black after 1 or 2 weeks. 



Xylose, glucose, galactose, lactose, malt- 

 ose, cellobiose, cellulose, alginic acid, agar 

 and starch are utilized, but not arabinose, 

 sucrose or chitin. 



Yeast extract and peptone are the only 

 suitable nitrogen sources known. 



Weakly catalase-positive. 



Indole not produced. 



Nitrites produced from nitrates. 



