710 Wisconsin Academy of Sciences, Arts, and Letters. 
This mildew is near Basidiophora which it resembles in the 
position of the conidia and the character of the basidia but dif¬ 
fers in the apical portion of the conidiophore not being abruptly 
swollen and rounded, but branched or cleft. In the Dexterville 
collection immature oospores of the ordinary Plasmopara type 
were found. 
Plasmopara cephalophora n. sp. 1. Conidiophore. 2 and 3 side and face views of 
conidium. Magnified 775 diameters and reduced one-half. Drawn by Mabel M 1 . Brown 
with aid of camera lucida. 
Peronospora silenes Wilson. On stems, leaves and fructifica¬ 
tion of Silene antirhina. Necedah. Oospores especially abun¬ 
dant in the capsules. 
Peronospora linariae Fckl. On leaves and stems of Linaria 
canadensis. Lyndon Station. With oospores. 
Of a collection on living leaves of TJrtica the following notes 
were made: Spots immarginate, round to oval, blackish brown 
becoming cinereous above, olivaceous becoming brownish below, 
1-2 y 2 cm. long, often confluent; perithecia hypophyllous, scat¬ 
tered, prominent, about 120,u in diameter; asci clavate-cylind- 
rical, incurved, octosporous, 40-60 x 7-9/x; ascospores hyaline, 
fusoid, obtuse, becoming triseptate, 16-21 x 4-5^; paraphyses 
filiform, very slender. On living leaves of TJrtica gracilis. 
