852 
Wisconsin Academy of Sciences, Arts, and Letters . 
PERONOSPORA OBOVATA Bon. 
On Spergula arvensis 
PERONOSPORA ALSINEARUM Caspary 
On Cerastium nutans 
PERONOSPORA FICARIAE Tul. 
On Ranunculus fascicularis 
pennsylvanicus 
septentrionalis 
PERONOSPORA CORYDALIS DBy. 
On Dicentra cucullaria 
PERONOSPORA PARASITICA (Pers.) Tul. 
On Draba caroliniana 
Lepidium virginicum 
Raphanus sativus (cult.) 
Brassica nigra 
arvensis 
RacDicula palustris 
Dentaria laciniata 
Cardamine douglassvi 
Arabis laevigata 
PERONOSPORA POTENTILLAE DBy. 
On Potentilla monspeliensis 
Geum canadense 
macrophyllum 
strictum 
rivale 
Agrimonia parviflora 
PERONOSPORA RUBI Rabh. 
On Rubus canadensis 
PERONOSPORA TRIFOLIORUM DBy. 
On Medicago sativa (cult.) 
PERONOSPORA VICIAE (Berk.) DBy. 
On Pisum sativum (cult.) 
Vicia americanaf 
PERONOSPORA EUPHORBIAE Fckl. 
On Acalypha virginica? 
Euphorbia maculata 
