PERONOSPORAEES 



1045 



. 



N 



Fig. 88. Pythiogeton 



A-D. Pythiogeton transversum Minden: A, group of sporangia, one of 

 which is discharging its contents; B, ejected contents free in the water; ( . 

 contents becoming segregated into zoospores; D, sex organs. E. Pythiogeton 

 ramosum Minden, two empty sporangia. F-N. Pythiogeton utriforme Minden: 

 F, empty sporangium; G, developing sex organs; M, mature oospore; /, mature 

 oospore with persistent antheridium; /, beginning of germination; KM, 

 further stages in resorption of oospore wall; N, formation of discharge tube 

 by germinating oospore. 



(A-H, Minden, 1916; I-N, Sparrow, 1936a) 



