262 



BOTA V )'. 



rounded into an oosphcrc. Each antlieridiuin now devel- 

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

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

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



Fig. 180. Cystopns candid-us. A, mycelium, with young oogonia, Off. J5, oogoni- 

 um. og ; on, oospore ; an, antheridium. 0, mature oogomum, r>(t, with oospore, o.; 

 at the left : s the le'imnnt of the nntheridium. D, mature oospore M-'ii in section. //. 

 beginnins; of gei munition of oospore, the enclosporu i with its contents escaping 

 through a rent in the epispore tor exospore). F, the endosporo i filled with swarm- 

 spores (zoopporis 1 * 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 spcrmatozoids, and the 



