Pig. g. Plasmopara viticola. i, Under surface of a vine leaf 

 showing patches of mildew ; 2, group of conidiophores bear- 

 ing conidia, x 80 ; 3, three conidia, x 300 ; 4, conidia forming 

 zoospores ; in a the zoospores are yet within the conidium ; in 

 b two zoospores have escaped from the conidium, x 300 ; 

 5, mature oospore or resting-spore, x 300 ; 6, an oospore 

 germinating and producing a conidiophore, highly mag. (after 

 Prillieux) ; 7, autumnal form of conidiophore bearing a few 

 large conidia, highly mag. (after Prillieux). 



