28 



ELEMENTARY STUDIES IN BOTANY 



>Sf 



FIG. 20. Fucus: A, the eight eggs discharged from the oogonium; B and C, egg 

 surrounded by swarms of swimming sperms. After STRASBURGER. 



connected by tubes, and all of the cells of one filament 

 empty, which means that all of the gametes of one filament 

 have passed over into the cells of the other filament. If the 



FIG. 21. Vaucheria: A, part of a filament, showing the special branches producing an 

 antheridium (a, emptied in this specimen) and an oogonium (fc) ; B, another species, 

 in which a single branch bears several oogonia and a terminal coiled antheridium. 



