42 



COMPARATIVE MORPHOLOGY OF FUNGI 



The highest stage of development is reached by Polyphagus Euglenae, 

 parasitic on resting stages of Euglena (Nowakowski, 1876: Dangeard, 

 1900; Wager, 1913). Its zoospores are very large, 5 to 13 X 3 to 5/x 



Fig. 26. — Polyphagus Euglenae. 1. Swarming zoospores. 2, 3. Thallus with pseudo- 

 podia. 4. Beginning copulation. 5. Young zygote, female nucleus about to enter copula- 

 tion tube. (1 to 3 X 670, 4, 5 X 510; after Wager, 1913.) 



(Fig. 26, 1). After they have come to rest and surrounded themselves 

 with a membrane, they form the first rhizoids in 1}^ to 2 hours. These 

 grow rapidly and in 3 hours become 5 to 6 times the diameter of the 



