BROWN ALGAE 



383 



antheridia (Fig. 319, A). The female conceptacle is of like structure, 

 but bears unbranched hairs, and associated with thdii ;",• tl,f. i^rge 



^ 



v/// 



Fig. 32J. 

 Eclocarpus secunda. (After Sauvagean.) i. filament bearing plurilocular sporangia 

 (or gametangia) : ^ male, $ female, ii. male gametes, iii. female gametes. 

 iv.-vi. stages in fertilisation, vii., viii. zygotes, (i. >' 200 ; ii.-viii. x 500.) 



oogonia, which are large enough when mature to be seen with the 

 naked eye (Fig. 319, B). 



riG. 3^3- 



Culleria multifida, showing the smaller, male gametangia (or nlurikvuUr 

 sporangia), and the larger female. Top-left are spennatozoids. lop-right arc ova. 

 Below are three stages of fertilisation. ( ■■■ 500.) (After Reinke.) 



The antheridium itself is an oval unicellular body, .surrounded by 

 a cell-wall. When young it contains a single nucleus, which divides 



