108 



ORDER I. PSEUDOMONADALES 



Nat. Acad. Sci., 8, 1896, 22; Chester, Man. 

 Determ. Bact., 1901, 325.) 



stri.a'ta. L. v. strio to groove; L. part. adj. 

 striatus grooved. 



Slender rods, of variable lengths, staining 

 irregularl}^ occurring singly and in pairs. 

 Motile, possessing polar flagella. Gram-nega- 

 tive. 



Gelatin colonies: Circular, yellowish, with 

 filamentous border. 



Gelatin stab: No liquefaction. 



Agar slant: Smooth, glistening, irregular, 

 spreading. Agar becomes j-ellowish green. 



Broth: Turbid, becoming slightly greenish. 



Litmus milk: No coagulation; becoming 

 alkaline; litmus reduced. 



Potato: Moist, glistening, spreading, be- 

 coming chocolate-brown. 



Indole not produced. 



Aerobic. 



Grows well at 25° and 36° C. 



Source: Isolated from soil. 



Habitat: Soil. 



22. Pseudomonas ovalis Chester, 1901. 

 (Bacillus fltmrescens ovalis Ravenel, Mem- 

 oirs Nat. Acad. Sci., 8, 1896, 9; Chester, 

 Man. Determ. Bact., 1901, 325.) 



o.va'lis. L. n. ovum an egg; M.L. adj. 

 ovalis oval. 



Rods, short with rounded ends, occurring 

 singly. Motile, possessing polar flagella. 

 Gram-negative. 



Gelatin colonies: Irregular, lobate, 

 slightly granular, translucent, grayish be- 

 coming bluish. 



Gelatin stab: No liquefaction. Faintly 

 green near surface. 



Agar colonies: Circular, opaque, entire, 

 greenish fluorescence. 



Agar slant: Thin, spreading, greenish 

 white. Agar becomes j'ellowish. 



Broth: Turbid, with pellicle and white 

 sediment; faintly green. 



Potato: Scant, yellowish brown growth. 



Indole not produced. 



Aerobic, facultative. 



Grows well at 25° and 36° C. 



Source: Isolated from soil. 



Habitat: Soil. 



and Anderson, Jour. Bact., 23, 1932, 343; 

 not Pseudomonas graveolens Migula, Syst. d. 

 Bakt., 2, 1900, 934.) 



taet'ro.lens. L. adj. taeter offensive; L. 

 part, olens having an odor; M.L. part. adj. 

 taetrolens foul-smelling. 



Short rods with rounded ends, occurring 

 singly, in pairs and in short chains. Motile 

 (Levine and Anderson). One to five polar 

 flagella (found on retest of cultures bj- 

 Haynes, 1953). Gram-negative. 



Gelatin stab: Not liquefied. 



Agar colonies: Circular, slightly raised, 

 smooth, entire, amorphous internal struc- 

 ture. 



Agar slant: Growth abundant and tan- 

 colored; medium darkened. Penetrating 

 odor of must. 



Broth: Turbid; thin, oily pellicle and 

 sediment. Odor of must. 



Litmus milk: Acid, coagulated; litmus 

 reduced. 



Indole not produced. 



Nitrites not produced from nitrates. 



Hj'drogen sulfide produced. 



Starch not hydrolyzed. 



Acid but no gas produced from glucose, 

 lactose, galactose, mannose, fructose, 

 rhamnose and xjdose. Slight acidity in 

 glycerol and mannitol. No acid or gas from 

 aesculin, amygdalin, arabitol, dextrin, dul- 

 citol, glycogen, inulin, maltose, melizitose, 

 pectin, raffinose, salicin, sorbitol, starch, 

 sucrose, xylan, arabinose, erythritol or 

 trehalose. 



Aerobic. 



Catalase-positive. 



Optimum temperature, between 23° and 

 25° C. Scant growth at 33° and 10° C. 



Distinctive character: A strong musty- 

 odor develops in media in which this or- 

 ganism grows. In this respect it resembles 

 P. perolens which, however, liquefies gelatin 

 and reduces nitrates. 



Source: Isolated from musty eggs; also 

 from milk by Olsen and Hammer (Iowa 

 State College Jour. Sci., 9, 1934, 125). 



Habitat : Found in various foods that have 

 a musty odor; presumably widely dis- 

 tributed. 



23. Pseudomonas laelrolens Haynes, 

 7iom. nov. (Pseudomonas graveolens Levine 



24. Pseudomonas incognita Chester, 

 1901. (Bacillus fluorescensincognitus'WTight, 



