FAMILY PSEUDOMOXADACEAE 



107 



52. Pseudomonas membranoformis 

 (Zobell and Allen) Zobell. (Achromo- 

 bacter membranoformis Zobell and Allen, 

 Jour. Bact., 29, 1935, 246; Zobell, Jour. 

 Bact., 46, 1943, 45). From Latin jnem- 

 brana, membrane, and forma having the 

 form of. 



Rods: 0.9 to 1.2 by 3.5 to 4.8 microns, 

 occurring singly and in pairs. Motile 

 with lophotrichous flagella. Encapsu- 

 lated. Gram-negative. 



Gelatin stab: Growth fihform, best at 

 top, with slow crateriform licjuefaction. 



Agar colonies: Circular, 1.0 to 2.5 mm, 

 with crinkled surface. 



Agar slant : Moderate, beaded, raised 

 growth. Membranous consistency. Be- 

 comes browned with age. 



Broth : Slight turbidity, tl(jcculent sedi- 

 ment, film of growth on walls of test tube. 



iNIilk: Xo growth. 



Potato: Xo growth. 



Indole not formed. 



Nitrites not produced from nitrates. 



No H2S produced. 



Acid but not gas from glucose, sucrose, 

 dextrin and mannitol. Xo acid from 

 lactose or xylose. 



Xo diastatic action. 



Optimum temperature 20° to 25°C. 



Aerobic. 



Source : Sea water. 



Habitat : Sea water. 



53. Pseudomonas marinoglutinosa 



(Zobell and Allen) Zobell. (Achromo- 

 bacter marinoglutinosus Zobell and Allen, 

 Jour. Bact., 29, 1935, 246; Zobell, Jour. 

 Bact., 46, 1943, 45). From Latin 

 marinas, pertaining to the sea, and 

 glutinosus, full of glue, sticky. 



Short rods: 0.7 to 1.0 by 1.8 to 2.4 mi- 

 crons, with rounded ends, occurring 

 singly, in pairs and in clumps. Motile 

 with polar flagella. Staining granular. 

 Encapsulated. Gram-negative. 



Gelatin stab : Moderate filiform growth 

 with slight napiform liquefaction. Xo 

 pigment. 



Agar colonies : Ptound with concentric 



circles and crinkled radial lines, 1.5 to 

 5.0 mm. in diameter. No pigment. 



Agar slant: Moderate, filiform, flat. 

 Butyrous consistency. 



Broth: Moderate clouding, marked 

 ring, adherent film of growth on test tube 

 wall, and flaky sediment. 



Milk : No growth. 



Potato: Xo growth. 



Indole not formed. 



Xitrites not produced from nitrates. 



Hydrogen sulfide and ammonia pro- 

 duced from Bacto-tryptone. 



Acid but not gas from xylose and dex- 

 trin. Xo acid from glucose, lactose, 

 sucrose and mannitol. 



Starch is hydrolyzed. 



Optimum temperature 20° to 25°C. 



Aerobic, facultative. 



Source : Sea water. 



Habitat: Sea water. 



54. Pseudomonas gelatica (Gran) 

 Bergey et al. (Bacillus gelaticus Gran, 

 Bergens Museums Aarbog., 1902, 14; 

 Bacterium gelaticum Lundestad, Cent, 

 f. Bakt., II Abt., 75, 1928, 328; Bergey 

 et al., Manual, 3rd ed., 1930, 175.) From 

 French, like gelatin. 



Pods, ^vith rounded ends, 0.6 to 1.2 by 

 1.2 to 2.6 microns, occurring singly, in 

 pairs, and sometimes in short chains. 

 Motile. Gram-negative. 



Fish-gelatin colonies : Circular, trans- 

 parent, glistening, becoming brownish in 

 color. 



Fish-gelatin stab : Liquefaction infun- 

 dibuliform, with greenish color. 



Sea-weed agar colonies : Circular, flat, 

 entire, glistening, reddish-brown center 

 with gra.vish -white periphery. Lique- 

 fied. 



Fish-agar slant: Flat, transparent 

 streak, with undulate margin, reddish- 

 brown . 



Broth : Turbid with flocculent pellicle, 

 and greenish-yellow sediment. 



Indole not formed. 



Xitrites are produced from nitrates. 



Starch hydrolyzed. 



