CHYTRIDIALES 453 



(1873: 1, pi. 1, figs. 12-17, pi. 2, figs. 6-8), Hungary; Euglena viridis, 

 Blytt (1882: 29), Norway; Euglena sp., Dangeard (1886a: 303, pi. 13, 

 figs. 31-35; 1900-1901c: 213, figs. 2-3, pis. 6-7), France; Euglena sp., 

 de Wildeman (1890: 27), Belgium; encysted Chlamydomonas reinhardi, 

 Serbinow (1907: 163), Russia; Euglena sp., H. E. Petersen (1909: 410; 

 1910:544), Sparrow (1936a: 453), Denmark; Euglena viridis, Wager 

 (1913: 173, pis. 16-19), Great Britain; cysts of Euglena viridis and 

 Chlamydomonas sp., Valkanov (1931a: 365), Bulgaria; Euglena viridis, 

 Graff (1928: 165), E. viridis and E. sanguinia, cysts of Chlamydomonas 

 reinhardi, Chlamydomonas sp., Bartsch {he. cit.), United States. 



Sparrow (1936a; 1943) suggested and Bartsch (1945) proved beyond 

 question that Nowakowski was dealing with two different species of 

 Polyphagus, one with spiny-walled and the other with smooth-walled 

 resting spores. Bartsch (1945: 559) concluded from studies of unizygo- 

 sporic cultures through many generations that "the nature of the zygo- 

 spore wall is a persistent and inherited character whose fundamental 

 features are influenced little if at all by environmental conditions." 

 Because of this and differences between the two forms, he segregated 

 Nowakowski's fungus with smooth walls as P. laevis. 



Encysted prosporangia have been noted in Polyphagus euglenae by 

 Dangeard and Wager. These are uninucleate and germinate to form a 

 small sporangium. Sporangia of two size classes have been noted, as 

 has also a relatively wide variation in the size of the zoospores. The 

 possibility of the occurrence of sexual differentiation of the zoospores, 

 as suggested by Kniep (1928), should not be overlooked in future 

 investigations of this species. 



The cytology of the species is well known from the researches of 

 Dangeard and Wager (see "Cytology," p. 85). 



Polyphagus laevis Bartsch 



Mycologia, 37: 567, figs. 1-8, 19-23. 1945 



(Figs. 4 Z-Z, p. 72; 29 F-G, p. 450) 



Polyphagus euglenae Nowakowski pro parte Cohn, Beitr. Biol. Pflanzen, 



2:203, pi. 8, figs. 8-11; pi. 9, figs. 7-13, 16. 1876. 

 P. euglenae var. minor Nowakowski, Akad. umiejetnosci Krakowie. Wyd- 



ziat mat.-przyrod., Pamietnik, 4: 174, pi. 10, figs. 97-100. 1878. 



