Explanation of Plate IV. 



Fig. I. Taphrina .esculi (Ell. i: Ever.) on leaves of ^-Escultis califor- 



nka Nutt. 

 Fig. 2. M.\GNUSiELLA POTEXTiLL.E (Farl.) Sadeb. on leaves of Potcntillce 



ccniadoisis Linn. 

 Fig. 3. Taphrin.v ulmi (Fuckel ) Joh inson on le.ives of L'liiiiis americana 



Linn. 

 Fig. 4. Magxusiella flava (Farl.) Sadeb. on leaves of Betula populifo- 



Uii Ait. 



All the figures in Plates I., IL, III. and IV. are X 590 diameters and 

 drawn bv the aid of a camera lucida. 



