64 Bulletin 313 



Phyllosticta bataticqla E. & M. — On the leaves of the sweet 

 potato. Causes small, roundish, whitish spots with purplish mar- 

 gins. Pycnidia scattered, minute, and black; conidia ellipsoid, 

 5x2/1. 



320. Infected leaf of Convolvulus sp. 321. Spores, 1/12. 



Phyllosticta Castanet E. & E. — On the leaves of the chestnut. 

 Causes brown or ochre-colored spots with obscure margins, ICX) /t 

 in diameter, collapsing, spores hyaline or smoky-colored, oval, some- 

 times obtusely pointed at one end, 5-7 x 2-2.5 fi. 



322. Portion of infected leaf of Castanea dentata. 323. Spores, 1/12. 



Phyllosticta catalp^ E. & M. — On the leaves of the Catalpa. 



Causes more or less circular, scattered, often confluent, brown spots 



3-6 mm. in diameter. Pycnidia scattered sub-cuticular, small black, 



erumpent, 112 x 84 /x; conidia 5-7 x 2.5-4.5 /x. 



324. Portion of infected leaf of Catalpa sp. 325. Pycnidia, 2/3. 326. 

 Cross-section of pycnidium, 2/2). 327. Spores, 1/12. 



Phyllosticta circumscissa Cke. — On the leaves of peach, 

 cherrv^ and other drupaceous hosts. Causes orbicular, reddish- 

 brown spots with reddish margins, center falling out and producing 

 shot-hole effect. Pycnidia dark, minute, scattered, spores elliptical, 

 ovoid, 8x2/4 (in culture ovoid, elliptical or irregular, 2.6 x 2.6- 

 4.4 fi). Usually associated with Cercospora. 



328. Pycnidia, 2/3 from cherr}' leaf. 329. Spores from same, 1/12. 330. 

 Spores, 1/12, from peach leaf. 331. Pycnidia, 2/3 from culture. 332. Spores 

 from same, 1/12. 



Phyllosticta clethricola C. & M. — On the leaves of Clethra 

 alnifolia. Causes circular, frequently confluent, reddish-brown 

 spots, 2-10 mm. in diameter, with dark borders. Pycnidia on both 

 surfaces of leaf, small, erimipent, ostiole small ; conidia hyaline, 

 OA'ate, guttuate surrounded by gelatinous envelope which frequently 

 forms hair-like appendage, 9 x 6 yu,. 



333. Infected leaf of Clethra alnifolin. 334. Spores, 1/12. 



Phyllosticta concentrica Sacc. — On the leaves of Hedera 

 helix. Causes large, more or less circular, pale, dry spots. Pycnidia 

 arranged concentrically, lenticular, dark, ostiole broad, 90-100 /i; 

 spores globose to ovoid, hyaline, minutely pluriguttulate, 7.7-10 x 

 6.6-6.8 II. 



335. Pycnidium, 2/3. 336. Spores, 1/12. 



Phyllosticta cruenta (Fr.) Kick. — On the leaves of SmUacina 

 racemosa. Causes circular or oblong, sometimes confluent, reddish 



