68 Bulletin 313 



Phyllosticta oroxtii E. & M. var. adveym. — On the leaves of 

 Nymphcca advena. Causes pale yellow to brawn more or less con- 

 centrically-ridged spots, surrounded by narrow, definite, sub-elevated 

 margin, center definitely margined and pale and bearing the pyc- 

 nidia; pycnidia on both sides of the spot, erunipeat; spores ovate 

 and oblong, somewhat irregular, 5-8 x 2.5-3 /i. Also reported on 

 Orontium aquaticum. 



352. Spots on leaf of Nymphcca advena. 353. Pycnidia, 2/3. 354. Spores, 

 1/12. 



Phyllosticta pavi^ Desm. (= Guignardia cbscuH (Peck.) 

 Stewart, page 42). 



Phyllosticta phaseolina Sacc. — On the leaves of beans. 

 Causes scattered, irregular, more or less circular spots about 2-lQ 

 mm. in diameter. Pycnidia scattered, lenticular, erumpent, 70-90 fi 

 in diameter; conidia ovoid to oblong, occasionally slightly cun^ed, 

 4-6 X 2-2.5 fi. 



355. Infected leaflet of bean. 356. Leaf spots. 357. Pycnidia, 2/3. 358. 

 Spores, 1/12. 



Phyllosticta rosicola ]\Iass. — On die leaves of the rose. 

 Causes irregular reddish spots, becoming dry with age, and often 

 limited to the upper surface. Pycnidia prominent on the under 

 side, black punctiform, 50-70 /a in diameter; spores small oblong, 

 2.5 X 1 /i,. 



359. Infected leaf of rose. 360. Pycnidium, 2/3. 361. Ostiolium, 1/12. 

 362. Spores, 1/12. 



Phyllosticta solitaria E. & E. - — On the leaves, twigs and 

 fruits of the apple. Causes spots on leaves, cankers on twigs, and 

 blisters on fruits. The leaf spots are small, irregular in shape, 

 light brown, yellowish or whitish. The cankers on the twigs and 

 fruit branches are usually small, with definite outline, reddish or 

 purplish, becoming gray with a purplish margin which usually dis- 

 appears ; bark cankers along the line of demarcation between dis- 

 eased and healthy tissue. On water sprouts the cankers are much 

 larger and resemble those on the fruit. The fruit blotches start as 

 small, light brown blotches which enlarge, become darker in color 

 and irregular and jagged in outline. Pycnidia small and immersed 

 in tlie tissue of the host. Conidia broadly elliptical, 8-10 x 5-6 /n. 



363. Infected apple. 364. Pj^cnidium, 2/3. 365. Cross-section of pycnidium, 

 2/3. 366. Spores, 1/12. 367. Infected apple twig. 368. Pycnidium from 

 same, 2/3. 369. Spores from the same, 1/12. 370. Germinating spores, 1/12. 

 371. Infected fruit of English hawthorne. 372. Pycnidium, 2/3. 373. Spores, 

 1/12. 



