142 Bulletin 313 



Cercospora rubi Sacc. — On the leaves of Rubus canadensis, R. 

 fructicosa and probably other species of the genus. Causes dry red- 

 dish-brown to ashy spots. Conidophores densely fasciculate, short, 

 dark-brown, slightly branched, usually 1- or 2-septate, 40 x 4 /a; coni- 

 dia attenuated at the top, curved, multi-septate, almost hyaline, 

 50-100 X 4.5 IX. 



d>Z7. Infected leaf of Rubus canadensis. 838. Conidiophores, 1/12. 839. 

 Conidium, 1/12. 840. Germinating conidium, 1/12. 



Cercospora symplocarpi Peck. — On the leaves of Symplocarpus 

 joetidus. Causes definite suborbicular, brown spots 0.25 — 0.5 cm. 

 broad, limited by a dark zone. Conidiophores on both surfaces of 

 the leaf, short and dark-colored; conidia long, narrowed at tip, ob- 

 clavate, pale, septate, 75-125 fi long. 



841. Coniodiophores, 1/12. 842. Conidia, 1/12. 



Cercospora viol^ Sacc. — On the leaves of violet. Causes circu- 

 lar, whitish, dry spots, visible on both surfaces. Conidiophores, 

 simple or slightly branched, 30-35 x 4 /a; conidia, long, tapering, 

 multi-septate, hyaline. 



843. Infected leaf of violet. 844. Conidiophores, 1/12. 845. Conidia, 1/12. 



