270 



PLANT LIFE. 



plants, though the small ones produce very slender, weak fila- 

 ments (fig. 302). JJeside the zo(jspores, llnthri.x produces, 

 under certain conditions, gametes, which are precisely like 



Frr,, 301. — UtothTix zonata. A, a young filament witli rhiznid cell. 1\ at base. F. bit 

 of a filament fromwbose cells large zoospores are escaping through a pore in t!ie side- 

 wall. C, a single large zoospore. ]}, bit of a filament from whose cells small zoo- 

 spores (or gametes! are escaping R, small zoospores (or gametes . /', gametes con- 

 iugatmg. C, same, conjugation complete. /-/. zygote, before formation of wall to 

 become a resting spore. Ma.gnified 4X2 diam. — .After llodcl-Port. 



the small zoospores in appearance. But their behavior is 

 different. They usually conjugate freely in pairs and produce 

 resting spores. If, howe\'er, they do not conjugate, each 



