362 



BOTANY. 



rounded into an oosphere. Each antheridium now devel- 

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

 nium {i, Fig. 178), and finally reaches the oospore (c. Fig. 

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



Fig. l^.—Cystopns candidus. A, mycelhim, with yonn^ oogonia, og, S, oogoni- 

 "nm, og ; os, oospore ; /m, antheridium. C. mature oogonmm, 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 exospore). F, the endospore i filled with Bwarm- 

 Bpores (zoospores) rusting on the empty epispore. (?, 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 



