THE POTATO FUNGUS. PERONOSPORA INFESTANS. 
PLATE I. 
Resting spores of the Potato Fungus, enlarged 400 diameters, with zoospores and 
A. 
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HOW OS 
zoospores germinating. 
Oospore within Oogonium. 
Two resting spores within one Oogonium. 
Three oe 43 i9 
Double Oogonium. 
Oogonium breaking up by cracking or \ 
Bladder thus discharged ia” ee ~ Oospores effete. 
Perishing in fine dust / 
Germination commencing, Oospores filling all Oogonium. 
Oospore breaking up into Zoospores. 
Zoospores more mature. 
Bladders containing Zoospores from within Oospore being discharged from 
Oogonium as in Cystopus. 
Bladder breaking up into dust setting quiescent zoospores’free, 
Tails develope on Zoospores. 
Anterior cilium is pushed forward. 
Tails fall into fine dust, when at length Zoospores come to rest. 
Some Zoospores burst and perish. 
Others throw out mycelium which bears the conidiophores of the new 
fungus. 
