262 



BOTANY. 



rounded into an oosphere. Each antheridium now devel- 

 ops a tubular beak-like process, which penetrates the oogo- 

 'nium (J, Fig. 178), and finally reaches the oospore (c, Fig. 

 178, and Fig. 179). It appears that the contents of the an- 



Fig. 180. Cyatopm candidus. A, mycelium, with yonng oogoniaj og. B, oogoni- 

 nm. og ; os, oosporo ; an, antheridium. C, mature oogonium, og, with oospore, os ; 

 at the left is the remnant of the antheridium. D, mature oospore seen in section. E, 

 beginning of germination of oospore, the endospore i with its contents escaping 

 through a rent in the epispore (or exogpore). F, the endospore i filled with swarm- 

 spores (zooppores) resting on the empty epispore. G, swarm-spores (zoospores), each 

 with two cilia, x 400. After De Bary. 



theridium pass into the oosphere, as in a short time the 

 former is found to be empty, while the latter becomes envel- 

 oped in a cell-wall, and thus becomes an oospore. In the 

 process of fertilization there are no spermatozoids, and the 



