:214 The Ohio Journal of Science [Vol. XXI, No. 6, 



Sphaerotheca phytoptophila Kell. & Swingle. 



Butler and Hamilton Counties. On witches brooms of 

 Celtis occidentalis. 



Erysiphe cichoracearum DC. 



Butler, Montgomery, and Lake Counties. Also collected in 

 the first county by Freda M. Bachman. Very common and 

 found on an unusually large number of host plants. 



Erysiphe graminis DC. 



Butler County, collected and determined by Freda M, 

 Bachman. Probably in good condition when collected, but the 

 herbarium specimens are practically worthless now. I have 

 seen the conidial condition late in autumn, but have not found 

 the perithecia in Ohio. 



Erysiphe polygoni DC. 



Butler and Montgomery Counties. Also collected in the 

 first county by W. G. Stover and E. E. Duncan. This mildew 

 is found on several hosts in Ohio. It is very common on yard 

 grass (Polygofium aviculare). 



Uncinula circinata Cooke & Peck. 



Butler, Hamilton, and Lake Counties. Also collected in the 

 first county by Freda M. Bachman and V. E. Lantis. The 

 mycelium usually disappears early, but it sometimes accom- 

 panies the perithecia on the maple leaves. 



Uncinula clintonii Peck. 



Butler County. Also collected here by E. E. Duncan. Seen 

 but rarely. Previously reported from two localities in Ohio, on 

 Tilia americana, to which it may be confined in America. 



Uncinula fiexuosa Peck. 



Butler County. Also collected here by E. E. Duncan. Con- 

 fined to species of Aesculus, and little known in Ohio. 



Uncinula geniculata Gerard. 



Butler County, collected and. determined by Freda M. 

 Bachman and later by E. E. Duncan. On Morns rubra. Not 

 previously reported from Ohio. This species is known only in 

 North America and on the single host. The mycelium is 

 inconspicuous. 



