LAGENIDIALES 



939 



Fig. 75. Olpidiopsidaceae 



A-B. Olpidiopsis saprokgniae var. saprolegniae (Braun) Cornu in Saproleg- 

 nia sp.: A, sporangium in swollen tip of hypha; B, spiny resting spore with 

 companion cell. C. Olpidiopsis vexans Barrett, tip of hypha of Saprolegnia 

 litoralis containing smooth- and rough-walled sporangia and a rough-walled 

 resting spore with its companion cell. D-F. Olpidiopsis various Shanor : D, tip 

 of hypha of Achlya flagellata bearing smooth-, spiny-, and rough-walled zoo- 

 sporangia and a resting spore with its companion cell; E-F, germination of 

 resting spore. G. Rozellopsis septigena Karling in Saprolegnia sp., showing 

 emergence of zoospores. H. Petersenia irregulare (Constantineanu) Sparrow, 

 thallus in tip of Achlya hypha. /. Rozellopsis inflata (Butler) Karling, in 

 Phytophthora sp., showing discharge of zoospores. 



(A, Sparrow, 1943; B, Sparrow, 1932b; C-D, Shanor, 1939b; E-F, Shanor, 

 1939a; G, Prowse, 1951; H, Sparrow, 1943; /, Waterhouse, 1940) 



