58 



CHLOROPHYCEAE 







\r 



fey,, -r.' r t. 5 •> fiSl 

 ** — -t — 7 ■ ■' ■ •^y; 



i 





J .-' ?- •? i 









^*'^ 









i> '-v * •. ', r'. v.? 





t^^ 



K 



Fig. 42. Oedogonium. A-G, stages in cell division in Oe. grande ( x 526). 

 B, C, formation of ring. F, G, expansion of ring to form new cell. H, formation 

 of aplanospore in Oe. Nebraskense. I, Oe. ciliatum, position of antherozoid 

 2 hours after entering egg. J-M, stages in fertilization of ovum of Oe. Ameri- 

 canum. K, entrance of sperm. L, fusion of gamete nuclei. M, zygote. N, Oe. 

 Kurzii, dwarf male ( x 175). (A-M, after Ohashi; N, after Pringsheim.) 



