FAMILY XII. CORYNEBACTEEIACEAE 



593 



Source: Isolated from slimy heads of Dac- 

 tylis glomerata. 



Habitat: Pathogenic on Dactylis glomerata. 



23. Corynebacteriuni agropyri (C- 



Gara, 1916) Burkholder, 1948. {A planohader 

 agropyri O'Gara, Phytopath., 6, 1916, 343; 

 Burkholder, in Manual, 6th ed., 1948, 395.) 



ag.ro. py 'ri . Or. noun agrus field ; Or. noun 

 pyrus wheat; M.L. neut.n. Agropyron ge- 

 neric name of a grass; M.L. gen. noun agro- 

 pyri of Agropyron. 



Rods 0.4 to 0.6 by 0.6 to 1.1 microns. En- 

 capsulated. Non-motile. Gram-variable. 



Gelatin: No liquefaction. 



Nutrient agar slant: Meager, yellow, very 

 viscid growth. 



Broth: Light clouding with yellow precipi- 

 tate. 



Milk: Little-changed. Yellow sediment 

 formed. 



Acid but no gas from glucose, lactose, 

 sucrose and glycerol. 



Starch: Hydrolysis feeble. 



Nitrites produced from nitrates. 



Optimum temperature, between 25° and 

 28° C. 



This species is very similar to and may 

 be identical with Corynebacterium rathayi 

 Dowson. 



Source: Isolated from slimy heads of 

 wheat grass. 



Habitat: Found on wheat grass, Agro- 

 pyron smithii. 



24. Corynebacterium fascians (Til- 

 ford, 1936) Dowson, 1942. (Phytomonas fas- 

 cians Tilford, 54th Rept. Ohio Agr. Exp. 

 Sta. Bull. 561, 1936, 39; also see Jour. Agr. 

 Res., 53, 1936, 393; Dowson, Trans. Brit. 

 Myc. Soc, 25, 1942, 313.) 



fas'ci.ans. L. part. adj. fascians banding, 

 binding. 



Rods 0.5 to 0.9 by 1.5 to 4.0 microns. Non- 

 motile. Gram-positive. 



Gelatin: No liquefaction. 



Potato-glucose agar colonies: Light 

 cream-colored colonies appear after 72 

 hours. Punctiform, circular, later cadmium- 

 yellow to deep chrome. 



Nutrient agar slant : After one week streak 

 is filiform, flat, dull to glistening, smooth, 

 opaque, cream-colored and butyrous. 



Broth: Slightly turbid. Fragile pellicle 

 with distinct rim. 



Milk: Litmus becomes blue. Other changes 

 slight . 



Indole not produced. 



Hydrogen sulfide produced. 



Acid but no gas from glucose, galactose, 

 fructose, mannose, arabinose, xylose, malt- 

 ose, sucrose, glycerol, mannitol and dextrin. 

 No acid from rhamnose, lactose, raffinose 

 or inulin. 



Starch not hj-drolyzed. 



Nitrites produced from nitrates. 



Grows in 8 per cent salt. 



Aerobic. 



Optimum temperature, between 25° and 

 28° C. 



Source: Described from 15 single-cell iso- 

 lates from fasciated growths on sweet peas. 



Habitat: Pathogenic on sweet pea, chrys- 

 anthemum, geranium, petunia, tobacco, 

 etc. 



25. Corynebacterium hypertrophicans 



(Stahel, 1933) Burkholder, 1948. (Pseudo- 

 nionas hypertrophicans Stahel, Phyt. Ztschr., 

 6, 1933, 445; Burkholder, in Manual, 6th ed., 

 1948, 398.) 



hy. per. tro 'phi. cans. Gr. pref. hyper very; 

 Gr. adj. trophicus well-fed, stout, over- 

 grown; M.L. adj. hypertrophicans becoming 

 overgrown, producing a hypertrophy. 



Rods 0.6 to 0.8 by 1.2 to 2.8 microns. Mo- 

 tile by means of a single polar flagellum. 

 Bipolar staining. Gram-positive. 



Gelatin: No growth. 



Agar colonies: Slow growing, circular, 

 raised, wet-shining, white. 



Broth plus sucrose: Growth good. No 

 pellicle. 



Milk: No visible change. 



Indole not produced. 



Hydrogen sulfide not produced. 



Acid but no gas from glucose, fructose 

 and sucrose. No acid from lactose and glyc- 

 erol. The acids from sucrose are lactic and 

 formic. 



Nitrites not produced from nitrates. 



Aerobic. 



Source: Isolated from witches' brooms. 



Habitat: Pathogenic on Eugenia latifolia. 



26. Corynebacterium poinsettiae Starr 



