BLASTOCLADIALES 



629 



sporophytes were grown, hyphal outgrowths appeared bearing game- 

 tangia. These outgrowths, when transplanted, gave rise to mixed sporo- 

 phyte-gametophyte mycelia which eventually became either entirely 



Fig. 43. Life cycle of Cystogenes illustrated by Allomyces neo-moniliformis 



Indoh 



A, germinating resistant sporangium with outer wall split and two papillae 

 of discharge formed on the inner membrane; B, the same (enlarged) just 

 starting to release R. S. zoospores; C, primary R. S. zoospores emerging 

 from the germinated resistant sporangium, some still motile, ethers already 

 encysted and lacking flagella; D, cysts (gametangia), clustered at the mouth 

 of the empty resistant sporangium and each with a single papilla ; E, isogamous 

 gametes emerging from cysts; F-H, stages in the emergence of a quartet of 

 gametes from a cyst; /, germinating zygote; J, young sporophyte; K, hypha 

 of a mature plant bearing thin-walled zoosporangia (Z,Z) and heavy-walled 

 resistant sporangia (R,R)i L, zoospores emerging from a zoosporangium; 

 M, germinating zoospore. 



(Modified from Emerson. 1941) 



