Explanation of Plate III. 



Fig. I. Taphrina joHANSoxii Sadeb. on fertile catkins of Populus trem- 



ul aides Mich. 

 Fig. 2. Taphrina ccerulescexs (Mont. & Desm.) Tul. on leaves of 



^uercus phellos Linn. 

 Fig. 3. Taphrina virgixica Sadebeck & Seymour on leave-s of Ostryn 



virgimca Willd. 



