SEXUAL REPEOUrCTION OF PEE0^■OSP0}U TNFESTANS. 339 



\V.C.S,AD.i\iAT.5C' 



Vu. 1 



Transverse section of a fragment ot Potato-leaf with I'eroiwspota mfestain 

 (enlarged 250 diam.}. (Gard. Chron., July 17, 1875, p. 68.) 

 A. Hairs. B. Leaf-cells. C. Branch of Peronospora coming out of a 

 atomate. DD. Simple spores, conidia. EF. Swarm spores. G. Free zoo- 

 spores with cilia. H. Antheridium. J. Oogonium with contained oosphere. 



Z 2 



