IOWA ACADEMY OF SCIENCE 



33 



ed, so much so that it is difficult to make out the character of the asci 

 in mounts that are not stained. The asci are cylindrical, rounded or 

 somewhat flattened, 20-18x12-18/". The ascospores are usually num- 

 erous in the ascus and measure 4-5m in diameter. Comparison of the 

 material from Eliasson (specimens kindly furnished by Dr. Farlow) 

 indicates that the asci of this species are different from those of the 

 other species. It has not, however, been compared with letJiifer, but as 

 indicated above it apparently differs from that. 



Groups of asci. with ascospores ; 1 Taphrina acerina, 2 Taphrina polyspora, 

 3 Taphrina on Acer grandidentatum . 



Drawn by Charlotte M. King. 



