IOWA ACADEMY OF SCIENCE 



31 



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1 Leaves of Acer ffrandidentatum affected by Taphrina. 



2 Section of upper side of affected leaf ; a ascus, lying between cuticle and re- 

 mainder of cell-wall. 



3 Section of leaf showing earlier stage ; h, hyphae divided. 



4 Group of young asci (a) and short hyphae ih). 



5 Group of three asci with ascospores, indefinite in number. 



-Figures drawn by Miss Charlotte M. King. 



