2S6 PLANT LIFE. 



The most highly developed simjilc ovary (the carpogonium) 

 occurs in the red alg;e, in which it is often differentiated into 

 the ovary proper (which does not always form a distinct egg) 

 and a long Ijranch, the recei.)ti\'e ajiparatus, or trichogvne, 

 to which the sperm adheres and through which its nucleus 



Fig. 327. 



Fig 32S. 



FrG 329. 



Fig. 327. — Ovaiy of bladder wrack {Fucus ''csiciilosini). with ^nmu of the hairs. The 

 ovary is raised on a stalk cell ; it contains S eggs, of which 6 are shown. Magnified 

 160 diam. After Thuret. 



Fic;. 328. — The ovar>' of a red alga {-\>w,t/;'()^; }inilti /Idmn). ..^ , in process of ferti- 

 lization. ?to, egg nucleus (a dark cliromoplast lying near) ; j-/. sperm which has ad- 

 hered to the trichogyne t and caused the absorpticjn of the wall there ; n^, t!ie sperm 

 nucleus on the way down the tricho.gyne. />', a later stage, no and iis about to unite. 

 Magnified about 600 diam. — After Wille. 



Ftg. 320. — A branch of a red seaweed {/i'/r.T ////(>// /,f of'a,-n] bearing cystocaips (the 

 black dots). See hg. 330. Natural size. — After Kiitzing. 



travels to the o\-ar\- projier (fig. 328). The result of fertiliza- 

 tion is the production, often by a \ery coniplicaled process 

 of g'lowtli, of a spore-])rodu.cing liodv, the c\'stocarp (figs. 

 329, 330). The cystocarp is, in ]iart, the liomologue of the 

 sponipl)\te phase of higher plants. h'rom its interior non- 



