850 Wisconsin Academy of Sciences, Arts, and Letters. 
ALBUGO TRAGOPOGONIS (DC.) S. F. Gray 
On Iva xanthifolia 
Ambrosia artemisiaefolia 
Artemisia biennis 
Helianthus annuus 
Senecio aureus 
Cirsium muticum 
arvense 
Tragopogon pratensis 
porr'ijolius (cult.) 
PHYTOPHTHORA THALICTRI Wilson & Davis 
On Thalictrum revolutum 
dasycarpum 
PHYTOPHTHORA INFESTANS (Mont.) DBy. 
On Solanum tuberosum (cult.) 
BREMIA LACTUCAE Regel 
On Lactuca sativa (cult.) 
canadensis 
spicata 
PLASMOPARA HUMULI (Miyake & Takashashi) 
On Humulus Lupulus 
PLASMOPARA PYGMAEA (Unger) Schroet. 
On Hepatica acutiloba 
Anemone canadensis 
quinquefolia 
PLASMOPARA RIBICOLA Schroet. 
On Ribes cynosbati 
oxyacanthoides 
prostratum 
triste 
PLASMOPARA GERANII (Pk.) Berl. & Be? Toni 
On Geranium maculatum 
PLASMOPARA OBDUCENS Schroet. 
On Impatiens pallida 
biflora 
