288 



PLANT LIFE. 



The most highly developed simple ovary (the carpogonium) 

 occurs in the red algae, in which it is often differentiated into 

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

 and a long branch, the receptive apparatus, or trichogyne, 

 to which the sperm adheres and through which its nucleus 



Fig. 327. 



Fig 328. 



Fig 329. 



Fig. 327. — Ovary of bladder wrack (Fucus 7>esiculosus), with some of the hairs. The 

 ovary is raised on a stalk cell ; it contains 8 eggs, of which 6 are shown. Magnified 

 160 diam. After Thuret. 



Fig. 328. — The ovary of a red alga (Nemalion multtfidum). A, in process of ferti- 

 lization, no, egg nucleus 1'a dark chrnmoplast lying near) ; sfi, sperm which has ad- 

 hered to the trichogyne t and caused the absorption of the wall there ; ns, the sperm 

 nucleus on the way down the trichogyne. B, a later stage, no and ns about to unite. 

 Magnified about 600 diam. — After Wille. 



Fig. 329. — A branch of a red seaweed (Polysiphon ia o/>aca) bearing cystocarps (the 

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



travels to the ovary proper (fig. 328). The result of fertiliza- 

 tion is the production, often by a very complicated process 

 of growth, of a spore-producing body, the cystocarp (figs. 

 329, 330). The cystocarp is, in part, the homologue of the 

 sporophyte phase of higher plants. From its interior non- 



