^CIDIUM. 175 



^, podophylli. Mandrake Cluster Cup. 



Spots, round, scattered, bright yellow, hypophyllous. 

 Spores, abundant. 



The spots change to teleutospore spots early in summer. 

 Common on the leaves of the mayapple. You can hardly find a leaf 



that has not some of those parasitic spots. 



J^, Oenothera. The Evening Primrose Cluster Cup. 



Spores, of a beautiful pink color, coloring the leaf more or 

 less on both sides. Has the teleutospores following close on 

 the ripening of the uredospores. 



Common on the evening primrose. 



J^. caltha, Grev. Cowslip Cluster Cups. 



Growing on the caltha palustris leaves in clusters ; some- 

 what campanulate. 



Spores, bright orange, subglobose. 



^. grossularise. D. C. Currant-bush Cluster Cup. 



Peridia, in dense clusters ; spots yellow on the under side 

 of the leaf and petiole. 

 Spores, orange. 

 Common on the wild currant bushes all through the Valley. 



^. sanibuci. Elder-bush Cluster Cup. 



Peridia, in dense clusters, covering nearly the whole of the 



under surface of the leaf ; of a beautiful yellow color. Cups 



are beautifully visible with a common lens. 



The petioles of the common sambucus Canadensis are often nearly 

 covered with this parasite. 



M. violse. Schw. Violet Cluster Cup. 

 Peridium, small, yellow, becoming brown on the under 

 side of the leaf. 



On viola rotundifolium. 



