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IOWA ACADEMY OF SCIENCE 
112. Puccinia podophylli Schwein. 
On Podophyllum peltatum L. 
113. Puccinia polygon;! Pers. 
On Polygonum soandens L., Polygonum sp. 
114. Puccinia pruni-spinosa Pers. 
On Prunus hortulana Bailey. 
115. Puccinia rubigo-vera (DC.) Winter. 
On Elymus canadensis L. 
116. Puccinia silphii Schwein. 
On Silphium integrifolium Michx. 
117. Puccinia sorghi Schwein. 
On Oxalis strieta L,, Zea mays. 
118. Puccinia solida Schwein. 
On Anemone virginiana L. 
119. Puccinia xanthii Schwein. 
On Xanthium Canadense Mill. 
120. Gymnosporangium macropus Lk. 
On Malus ioensis (Wood) Britton, M. malus (L.) Britton, 
Juniperus virginiana L. Only of moderate frequency on 
cultivated apple but at times destructive to the wild crab 
and disfiguring the red cedar. 
121. Gymnosporangium clavariaeforme (Jacq.) Rees. 
On Crataegus tomentosa L. 
122. Gymnoconia peckiana (Howe) Franz. 
On Rubus nigrobaccus Bailey. Very common on the wild 
forms but the leading cultivated varieties seem somewhat 
resistant. 
122%. Phragmidium potentillae (Pers.) Karst. 
On Potentilla canadensis L. 
123. Phragimidium subcorticum (Schrank) Wint. 
On Rosa hemisphaerica Herrin. 
124. Phragmidium speciosuum Fr. 
On Rosa arkansana Porter. 
125. Coleosporium solidagineis (Schwein.) Thum. 
On Solidago canadensis L., S. ulmifolia Muhl. 
126. Coleosporium vernoniae B. & C. 
On Yernonia noveboracensis (L.) Y 7 illd. 
127. Coleosporium sonchi (Pers.) Lev. On Aster diffusus Ait. 
