134 Bulletin 313 



Cercospora circumscissa Sacc. — On the leaves of peach, cherry 

 and other drupaceous fruits. Causes circular, frequently confluent, 

 dry spots which break and fall out, leaving a characteristic "shot 

 hole." Conidiophores fasciculate, straight or flexuous, brownish, 

 non-septate or occasionally 1 -septate, conidia clavate, browTi, usually, 

 3-septate, 50 x 3.5-4 fi. 



796- Infected leaf of peach. 797. Infected leaf of Prumus serotina. 798. 

 Conidiophores, 1/12. 799. Conidia, 1/12. 



Cercospora clavata (Ger.) Peck.^On the leaves of the milk- 

 weed (Asclepias cornuti). Causes numerous minute, irregular often 

 confluent spots. Conidiophores densely fasciculate, light brown, 

 non-septate, 26-38 /x long; conidia elongated, clavate, usually curved, 

 1-10 septate, 35-75 x 5 ^u. 



800. Conidia, 1/12. 



Cercospora cruenta Sacc. — On the leaves and stems of cow- 

 peas and beans. Causes reddish spots. Conidiophores fasciculate, 

 pale olivaceous, non-septate ; conidia long and tapering, hyaline be- 

 coming olivaceous, multi-septate, 60-80 x 4 yu,. 



801. Conidia, 1/12. 



Cercospora diodi.5=; Cke. — On leaves of Diodia teres. Causes or- 

 bicular leaf spots. Conidiophores on the under surface of the leaf, 

 fasciculate, erect, septate, dark or olivaceous, 60-80 fi long; conidia 

 long and tapering, septate, 60 x 4-4.5 /x. 



802. Conidia, 1/12. 



Cercospora doi.ichii E. & E. — On the leaves of covvpea. Causes 

 reddish-brown .«;pots becoming gray in centers. Conidiophores fasci- 

 culate, tubercular at base, indistinctly septate, olivaceous, 20-35 x 

 4-5 fj.; conidia, slender, obclavate, multi-septate, 50-100 x 3.5-4 ^. 



803. Infected leaflet of cowpea. 804. Conidia, 1/12. 



Cercospora dubia (Riess) Wint. — On leaves of Chenopodium 

 album. Causes more or less circular spots of various sizes. Coni- 

 diophores on both surfaces, fasciculate, usually unbranched, may or 

 may not be septate, sooty-colored, 40-45 x 5-6 /m] conidia cylindrical, 

 somewhat fusoid, obtuse at one end, more or less pointed at the 

 other, frequently slightly curved, hyaline or slightly colored, 4-5 

 septate, 60-70 x 8-9 fi. 



805- Infected leaf of Chenopodium album. 806. Conidiophores, 1/12. 807 

 Conidia, 1/12. 



