FAMILY IV. PSEUDOMONADACEAE 



167 



plant; M.L. mas.n. Kicinus generic name of 

 the castor bean; L. v. colo to dwell; M.L. 

 fem.n. ricinicola, Ricinus dweller. 



Rods, 0.4 to 0.9 by 1.3 to 2.6 microns, 

 occurring in short chains. Encapsulated. 

 Motile with polar flagella. Gram-negative. 



Gelatin: Liquefied. 



Nutrient agar colonies: Lemon-yellow, 

 changing to brown. 



Milk: Slightly acid. No coagulation. Pep- 

 tonization. 



Nitrites not produced from nitrates. 



Acid but no gas from lactose. 



Starch hydrolyzed. 



Temperature relations: Optimum, be- 

 tween 29° and 30° C. Minimum, 2.5° C. Maxi- 

 mum, 39° C. 



Aerobic. 



Comment: Elliott (loc. cit.) renamed this 

 species to avoid confusion with Phytomonas 

 ricini Archibald. 



Source: Isolated from leaf -spot of castor 

 bean. 



Habitat: Pathogenic on Ricinus com- 



30. Xanthonionas sesbaniae Patel 

 et al., 1952. (Patel, Kulkarni and Dhande, 

 Curr. Sci.,^^, 1952,74.) 



ses.ba'ni.ae. M.L. fem.n. Sesbania generic 

 name of the plant host; M.L. gen. noun 

 sesbaniae of Sesbania. 



Rods, 0.7 by 1.3 microns, occurring singly 

 or in chains. Encapsulated. Gram-negative. 



Gelatin: Liquefied. 



Potato-glucose agar colonies: Circular, 2 

 cm in diameter in 7 daj^s, with striations 

 starting 5 mm awaj" from the center up to 

 the periphery. Barium-yellow. 



Litmus milk: Slightly peptonized with 

 casein digested. Litmus slowly reduced. 



Hydrogen sulfide produced. 



Nitrites not produced from nitrates. 



Acid but no gas from glucose, sucrose and 

 lactose. Salicin not attacked. 



Starch hydrolyzed. 



Temperature relations: Optimum, 31° C. 

 Thermal death point, 51° C. 



Source: Isolated from leaf spots on jSes- 

 bania aegyptiaca. 



Habitat: Pathogenic on Sesbania aegyp- 

 tiaca. 



31. Xanthonionas stizolobiicola Patel 

 et al., 1951. (Patel, Kulkarni and Dhande, 

 Curr. Sci., 20, 1951, 106.) 



sti.zo.Io.bi.i'co.la. M. L. neut.n. Stizolo- 

 biutn generic name of host; L. v. colo to 

 inhabit; M.L. fem.n. stizolobiicola the 

 Stizolobium dweller. 



Rods. Mostly single. Encapsulated. Mo- 

 tile. Gram-negative. 



Gelatin: Liquefied. 



Nutrient agar colonies : 8 mm in diameter 

 in 4 days, flat, entire, glistening, creamy to 

 pinard-yellow. 



Broth: Good growth. 



Synthetic asparagine medium: No growth. 



Loeffller's blood serum: Liquefied in 10 

 days. 



Hydrogen sulfide produced. 



Nitrites not produced from nitrates. 



Methyl red negative; acetylmethylcar- 

 binol not produced. 



Indole not produced. 



Acid but no gas from glucose, lactose and 

 sucrose. Salicin not attacked. 



Starch and casein hydrolyzed. 



Lipolytic. 



Salt tolerance: Up to 3 per cent. 



Optimum temperature, between 28° and 

 30° C. 



Aerobic. 



Relationship to other species: Elliott 

 (Man. Bact. Plant Path., 2nd ed., 1951, 129) 

 lists Xanthomonas phaseoli on Stizolobium 

 deeringianum. The two pathogens appear 

 similar. 



Source: Isolated from leaves, stems and 

 petioles of Stizolobium deeringianum in 

 India. 



Habitat: Pathogenic on Stizolobium 

 deeringianum. 



32. Xanthonionas taraxaci Nieder- 



hauser, 1943. (Phytopath., 33, 1943, 961.) 



ta.ra.x'a.ci. M.L. neut.n. Taraxacum ge- 

 neric name of host; M.L. gen. noun taraxaci 

 of Taraxacum. 



Rods, 0.7 to 1.2 by 1.4 to 3.3 microns, 

 occurring singly or in pairs. Motile with a 

 single polar flagellum. Gram-negative. 



Gelatin: Rapid liquefaction. 



Beef-extract peptone agar colonies: Cir- 

 cular, smooth, bright yellow. Growth mod- 

 erate. 



