•236 



PHJTOPHTHORA ON VINCA ROSEA 



to the same batch. Evidently theiefore theie can hardly be any difference 

 in the composition of their contents. Before they were inoculated they had 



Zoospores germinating and producing sporangia and secondary sporangia X 305. 

 Branches arising through septa. 



(a) shows the formation of a sporangium on such a branch X 305. 



Double antheridium X 557. 



Branched antheridium X 557. 



An oospore, tiie oogonium and antheridium of which arise from the same parent 



hypha. 

 The oogonium and antheridium are lateral in origin X 557. 

 An oospore, the oogonial stalk arises laterally from the antheridial stalk x 557. 

 An oogonium originating from within an antheridium X 557. 

 An oogonium piercing an antheridium on its way out at several points X 557. 

 An oogonium bifurcating within an antheridium X 557. 



An oogonium germinating v( getativoly X 557. 

 — 14. Germinating oospores X 557. 



In Figs. 11, 13 and 14 the oospore wall has completely dissolved. 

 In Fig 12 the oospore wall is partly dissolved and what is left of it is wavy 

 in outline. 



