156 



ORDER I. PSEUDOMONADALES 



T. Attacks members of the family Rubiaceae. 



24. Xanthomonas maculifoliigardeniae. 

 U. Attacks members of the family Rutaceae. 



12. Xanthomonas citri. 

 V. Attacks members of the family Scrophulariaceae. 



46. Xanthomonas antirrhini. 

 W. Attack members of the family Solanaceae. 



19. Xanthomonas hemmiana. 



47. Xanthomonas heterocea. 

 36. Xanthomonas vesicatoria. 



X. Attacks members of the family Tiliaceae. 



38. Xanthomonas nakatae. 

 Y. Attacks members of the family Umbelliferae. 



42. Xanthomonas carotae. 

 Z. Attacks members of the family Verbenaceae. 



13. Xanthomonas clerodendri . 



1. Xanthomonas hyacinth! (Wakker, 

 1883) Dowson, 1939. {Bacterium hyacinthi 

 Wakker, Botan. Centralblatt, 14, 1883, 315; 

 Dowson, Zent. f. Bakt., II Abt., 100, 1939, 

 188.) 



hy.a.cin' thi. Gr. hyacinthus the hyacinth; 

 M.L. mas.n. Hyacinthus generic name; M. 

 L. gen. noun hyacinthi of hyacinth. 



Description from Smith (Div. Veg. Phys. 

 and Path., U. S. D. A. Bui. 26, 1901, 40); 

 additional characters determined by Burk- 

 holder. 



Rods 0.4 to 0.6 by 0.8 to 2.0 microns. 

 Motile with a polar flagellum. Filaments 

 present. Gram-negative. 



Gelatin: Slow liquefaction. 



Agar colonies: Circular, flat, moist, 

 shining, bright yellow. Media stained 

 brown. 



Milk: Casein is precipitated and digested. 

 Tyrosine crystals produced. 



Nitrites not produced from nitrates. 



Indole: Slight production. 



Hydrogen sulfide produced. 



Acid but no gas from glucose, fructose, 

 lactose, sucrose, galactose, maltose, salicin 

 and ethyl alcohol. Slight acid from xylose. 

 Alkaline reaction in citrate. Mannitol, 

 dulcitol and malonate not utilized. 



Starch: Hydrolysis slight. 



Pectate medium not liquefied. 



Temperature relations: Optimum, be- 

 tween 28° and 30° C. Minimum, 4° C. Ma.xi- 

 mum, between 34° and 35° C. 



Aerobic, with the exception of maltose, 

 where it is facultatively anaerobic. 



Habitat: Produces a yellow rot of hj-a- 

 cinth bulbs, Hyacinthus ovientalis. 



2. Xanthomonas pruni (Erw. Smith, 

 1903) Dowson, 1939. {Pseudomonas pruni 

 Erw. Smith, Science, N. S. 17, 1903, 456; 

 Dowson, Zent. f. Bakt., II Abt., 100, 1939, 

 190.) 



pru'ni. L. prunus plum; M.L. fem.n. 

 Prunus generic name; M.L. gen. noun 

 pruni of Prunus. 



Description from Dunegan (U. S. Dept. 

 Agr., Tech. Bull. 273, 1932, 23). 



Rods 0.2 to 0.4 by 0.8 to 1.0 micron. 

 Encapsulated. INIotile with a polar flagellum. 

 Gram-negative. 



Gelatin: Liquefied. 



Beef -extract agar colonies: Yellow, circu- 

 lar, smooth, convex, edges entire. 



Broth: Turbid becoming viscid. 



Milk: Precipitation of casein; digestion. 



Nitrites not produced from nitrates. 



Indole not produced. 



Hydrogen sulfide not produced. Hydrogen 

 sulfide produced (Burkholder). 



Lipolytic (Starr and Burkholder, Phj^- 

 topath., 32, 1942, 600). 



Acid from arabinose, .xylose, glucose, 

 fructose, galactose, manno.se, maltose, lac- 

 tose, sucrose, rafRnose and melezitose. 



Starch is hydrolyzed (slight). 



Pectate medium not liquefied. 



Aerobic. 



Temperature relations: Optimum, be- 

 tween 24° and 29° C. Maximum, 37° C. 



