626 



A Q UA TIC PH YC O M YCETES 



produced. Emerson (1941) placed his isolates of this type in what might 

 be called a "form species'" and gave it a binomial, Allomyces anomalus 

 (Fig. 40 D-E, p. 616). The resting-spore zoospores upon emergence ger- 

 minate directly into new asexual plants like the parents. In the majority of 

 these isolates further manipulation resulted in the induction of a game- 

 tophyte phase similar to either that in Allomyces javanicus or that in 

 A. arbuscula. Some isolates, however, even after two years of obser- 



Fig. 42. Life cycle of Euallomyces illustrated by Allomyces arbuscula E.J. Butler 



"A. germinating resistant sporangium with outer wall split and a papilla 

 of discharge already formed on the inner membrane; B, R.S. zoospores emerg- 

 ing from the germinated resistant sporangium; C, germinating R. S. zoospore; 

 Z), young gametophytic plant; £, mature gametophytic hypha bearing female 

 and male gametangia; F, female and male gametes emerging from a pair of 

 gametangia; G, copulating gametes; H, planozygote; /, germinating zygote; 

 J, young sporophytic plant; K, mature sporophytic hypha bearing thin-walled 

 zoosporangia (Z,Z) and heavy-walled resistant sporangia (R,R); L, zoospores 

 emerging from a zoosporangium; M, germinating zoospore" (Emerson, 1941 ). 



