850 Wisconsin Academy of Sciences, Arts, and Letters. 



ALBUGO TRAGOPOGOXIS (DC.) S. F. Gray 

 On Iva xanthifolia 



Ambrosia artem isiaefolia 

 Artemisia biennis 

 Helianthus annuus 

 Senecio aureus 

 Cirsium muticum 



arvense 

 Tragopogon pratensis 

 porrjolius (cult.) 



PHYTOPHTHORA THALICTRI Wilson & Davis 

 On Thalictrum revolutum 

 dasycarpum 



PHYTOPHTHORA INFESTANS (Mont.) DBy. 

 On Solanum tuberosum (cult.) 



BREMIA LACTUCAE Regel 

 On Lartuca sativa (cult.) 

 canadensis 

 spicata n^ 



PLASMOPARA HUMULI (Miya/e & Takashashi) 

 On Humuhis Lupuhts 



PLASMOPARA PYGMAEA (Unger) Schroet. 

 On Hepatica acutiloba 

 Anemone canadensis 

 quinquefolia 



PLASMOPARA RIBICOLA Schroet. 

 On Ribes cynosbati 



oxyacanthoides 



prostratum 



triste 



PLASMOPARA GERANII (Pk.) Berl. & De! Tonl 

 On Oeranium maculatum 



PLASMOPARA OBDUCENS Schroet. 

 On Impatiens pallida 

 bi flora 



