Davis—•A Provisional List of Parasitic Fungi. 851 
PLASMOPARA VITICOLA (B. & C.) Berl. & De Toni 
On Psedera sp. indet. 
VMis labrusca (cult.) 
vulpina 
spp. indet. 
PLASMOPARA AUSTRALIS (Speg.) Swingle 
On Sicyos angultitus 
PLASMOPARA HALSTEDII (Farl.) Berl. & De Toni 
On Eupatorium urticaefolium 
Solidago riddellii 
Erigeron annuus 
Silphium teretiinthinaceum 
trifoliatum 
integrifolium 
perfoliatum 
Ambrosia artemisiaefolia 
trifida 
RudbecTcia laciniata 
Helianthus annuus 
occidentalis 
grosse-serratus 
divaricatus 
sttrumosus 
tuberosus 
Bidens frondosa 
vulgata 
connata 
cernua 
aristosa 
Erechtites hieracifolia 
PERONOSPORA SCHLEIDENI Unger 
On Allium Cepa (cult.) 
PERONOSPORA URTICAE (Lib.) DBy. 
On TJrtica gracilis 
PERONOSPORA POLYGONI Thuem. 
On Polygonum scandens 
PERONOSPORA EFFUSA (Grev.) Rabh. 
On Chenopodium hybridum 
album 
