OOSPORE-PRODUCING ALGAL FUNGI II 5 



papilla through which the germ tube grows (acroblastic). 



9. Bremi-a. 

 Conidiospores without papilla; pleuroblastic. 10. Feronospora. 



The most important species of these genera from the standpoint of 

 the plant pathologist are the following enumerated below with their 

 common English names where such have been given. 



Scientific name 



English name Host plant 



Pythium de Baryanum Damping-oS fungus. Seedlings 



Pylkiacyslis cilriopthoro Brown rot of lemon Lemon fruits 



Albugo (Cyslopus) Candida... ^Tiite rust of cnidfers. . . 1 Cruciferous [dants 

 Albugo (jCyslopus) portulaca: . ' White rust of purslane. . . Portulaca oleracea 



Pkytophthora caciorum Mildew of succulents I Cacti, etc. 



Pkylcpkthora infestans 1 Late blight of potato Potato 



Pkylophlhora pkasedi (Fig. | Downy mildew of beans . ; Lama-bean 



44)- I I 



Plasmopara cubensis Downy mildew of cu- Cucumber 



cumber. 



Plasmoparo HalsUdii Hdianllius annuus and 



I , B. luberosus 



Plasmcpara vili4MUi Downy mildew of grape. . 1 Grape vine 



Bremia laducti I Downy mildew of lettuce.] Cynara, Cineraria, Laduca 



Feronospora effusa \ Mildew of spinach Spinach 



Peronaspora parasitica Downy mildew of crudfers^ Cabbage 



Peronospara ScUeideniana . . . Onion mildew Onion 



