IOWA ACADEMY OF SCIENCE 
SYNCHYTRIACEAE. 
Synchytrium decipiens Farl. 
On Falcata comosa (L.) Kuntze, F. pitcheri (T. & GQ Kuntze.. 
peronospor ace ae (including Albuginaceae 1 ) . 
Cystopus Candidas (Pers.) Lev. 
On Bursa bursa-pastoris (L.) Britton. 
On Cochlearia armoracia L. 
On Lepidium apetalum Willd. 
On Raphanus sativus L. 
Roripa palustris (L.) Bess. Very common. 
Cystopus bliti (Biv.) Lev. 
On Amaranthus retrofiexns L. Common. 
Cystopus portulaceae (BC.) Lev. 
On Portulaca oleracea L. Moderately common. 
Plasmopara viticola (B. & C.) Berl. & De Toni. 
On Yitis labrusca L. Ordinarily does but little damage but 
becomes destructive some seasons. 
Plasmopara eubenis (B. & C.) Humphry. 
On leaves of Micrampelis lobata (Michx.) Greene. 
Peronospora arthuri Farl 
On Gaura biennis L. 
Peronospora gonolobi Lagerh. 
On Gonolobus laevis Michx. 
Peronospora parasitica (Pers.) De Bary. 
On Bursa bursa-pastoris (L.) Britt., Lepidium apetalum’ Willd., 
Sisymbrium officinale (L.) Scop., Sophia pinnata (Walt.) 
Britton. 
Peronosposa potentillae De Bary. On Potentilla monspeliensis L. 
Phytopthora infestans (Mont.) De Bary. 
Our Solanum tuberosum L. More or less destructive, some 
seasons but most years gives little or no trouble. 
exoascaeae. 
Excaseus deformans (Berk.) Fuckel. 
On Amygdalus persica L. Quite destructive some seasons. Dif- 
ferent varieties differ much in susceptibility. 
Exoascus pruni Fuckel. 
On Prunus americana Marsh and P. domestioai L. 
