156 B^Hiish Ficngi. 



beak wliicli pierces tlie cell-wall, and expands into 

 the zoo2ronidium at tlie surface. The zooo'onidiuni is 

 not separated from the basal cell by a septum, but a 

 constriction occurs at this point, or properly speaking, 

 tlie reproductive cell develops by a process of bndding 

 from the lower vegetative or sterile cell. The 

 rhizoids extend into the cell cavity. 



I first became acquainted with the present species 

 in a preparation of Spirogyra nitida sent years ago by 

 my friend Mr. W. West of Bradford, but at the time 

 did not know what it was. 



Polyphagus, Nowak. 



Spherical cells formed by the germination of 

 zoosporangia produce numerous rhizoids that become 

 immersed in the substratum, these cells eventually 

 become transformed into zoosporangia ; sexually pro- 

 duced by the conjugation of two cells which produce 

 a zygospore that is also a resfcing-spore, and which, 

 after a period of rest, gives origin to zoogonidia 

 similar to those contained in the asexually formed 

 sporangia. 



Polyphagus, I^owakowski, Beitr. Kennt. Chytr. 

 1876; Sacc. Syll. vii. 1, p. 302. 



Polyphagus euglense, Schroet. (figs. 78 — 82). 



Cellules of variable size, globose, ellipsoid, or curved, 

 when globose reaching to S7 fi diameter, when 

 elongated, up to 200 fz long, filled with hyaline pro- 

 toplasm, rhizoids penetrating the substratum, and 

 forming haustoria 6 fi thick; zoosporangia ovoid, 

 ellipsoid, or elongato-utriculiform, very variable in 

 size, protoplasm all breaking up into zoogonidia of a 



