160 



BOTANY. 



Upon escaping into the water they swim about vigorously, 

 eventually making their way through the opening in the 

 oogone, and then burying themselves in the substance of 

 the germ-cell {B, z, Fig. 88). After fertilization the 



Fio. 88.— Showing the sexual state of an Oedogoninm. 4, part of a fila- 

 ment with three oogones, ocr ; m, m, small filaments (dwarf males) wliich in 

 this species produce antherozoids ; JJ, an oogone at time of fertilization; 

 £>, part of filament of another species, showing escape of antherozoids. 

 Highly magnified. 



germ-cell becomes covered with a thick and colored (brown 

 or red) coat, and it then becomes a resting spore. 



284. After a period of rest the resting spore germinates 

 by rupturing its thick coat and permitting the escape of 



