FAMILY CYTOPHAGACEAE 



1013 



Growth on cellulose, cellobiose, cel- 

 lulose dextrins and glucose. On mineral 

 salts-silica gel plates covered with 

 filter paper, bright yellow glistening 

 mucilaginous patches are produced after 

 a few days. The filter paper in these 

 regions is gradually completely dissolved 

 and the patches become translucent. 



Ammonia, nitrate, asparagin, aspartic 

 acid and peptone can serve as sources of 

 nitrogen,according to Jensen {loc. cit.). 



Strictly aerobic. 



Optimum temperature 28° to 30°C. 



Source: Isolated from soil. 



Habitat: Soil. Decomposes plant res- 

 idues. 



2. Cytophaga lutea Winogradsky. 

 (Ann. Inst. Pasteur, 43, 1939, 599.) 



Etymology: Latin luteus, yellow. 



Dimensions of the cells approximately 

 those of Cytophaga aurantiaca (see below) 

 but rather larger and thinner and without 

 marked central swelling. Gram- 

 negative. 



Produces a brilliant yellow pigment 

 similar to that of Cytophaga hutchinsonii. 



This species differs only in size from 

 Cytophaga hutchinsoni, and is probably a 

 variety of it. 



Source: Isolated from soil. 



Habitat: Soil. Decomposes plant re- 

 sidues. 



3. Cytophaga aurantiaca Wino- 

 gradsky. (Ann. Inst. Pasteur, 43, 1929, 

 597; probably Mycococcus cytophagns 

 Bokor, Arch. Microbiol., 1, 1930, 34.) 



Etymology : Modern Latin aurantiacus, 

 orange-colored. 



Cells 1.0 micron wide at the center by 

 6 to 8 microns long. Except for size, very 

 similar to those of Cytophaga hutchinsonii. 

 Gram-negative. 



Produces orange mucilaginous patches 

 on filter paper-silica gel plates. Fibroly- 

 sis is very rapid and intense. 



Source: Isolated from soil. 



Habitat: Soil. Decomposes plant res- 

 idues. 



4. Cytophaga rubra Winogradsky. 



(Ann. Inst. Pasteur, 43, 1929, 598.) 



Etymology: Latin ruber, red. 



Pointed rods, straight or sometimes 

 slightly bent, occasionally hooked at one 

 end. Length approximately 3 microns. 

 Gram-negative. 



Produces diffuse, rapidly-spreading, 

 pink to brick-red patches on filter paper- 

 silica gel plates. Fibrolysis is much 

 slower and less extensive than that caused 

 by Cytophaga hutchinsonii. 



Source: Isolated from soil. 



Habitat : Soil. Decomposes plant resi- 

 dues. 



5. Cytophaga tenuissima Winogradsky. 

 (Ann. Inst. Pasteur, 43, 1929, 599; incor- 

 rectly spelled Cytophaga ternissima in 

 Bergey et al., Manual, 4th ed., 1934, 559.) 



Etymology : Latin tenuissinuis, most 

 tenuous, very slender. 



Dimensions of cells not given, but 

 described as being extremely slender. 

 Gram-negative. 



Produces mucilaginous, greenish to 

 olive patches on filter paper-silica gel 

 plates. 



Source: Isolated from soil. 



Habitat: Soil. Decomjxjses plant resi- 

 dues. 



6. Cytophaga deprimata Fuller and 

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



Etymology : Latin deprimo, to depress 

 or sink down. 



Rods : Long and flexuous with pointed 

 ends, 0.3 to 0.5 by 5.5 to 10 microns, 

 arranged 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 elevation. The edge spreads indis- 

 tinguishably into the surrounding 

 medium and shallow depressions develop 

 around the colony. Small colonies give 

 the plate a characteristic pitted ap- 

 pearance. 



Growth on cellulose dextrin agar is 



