TAXONOMY 



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ceptacles. Within these conceptacles the antheridia, or male sexual 

 organs, and the archegonia, or female sexual ogans, are produced. 

 The conceptacles also contain numerous branching filaments called 



FIG. 121. Fucus vesiculosus. Section of a female conceptacle. o, osteole 

 by which the eggs escape. The oval shaped dark objects represent oogonia in 

 different stages of maturity (highly magnified). 



paraphyses, which arise from the cells lining the cavities. The an- 

 theridia are found as outgrowths of these paraphyses and produce 

 sperms or male sexual cells. The oogonium is a large, globular, 



FIG. 122. Fucus vesiculosus. Fertilization. A, egg approached by bi- 

 ciliated sperms; B, sperms attached to egg and surrounding it prior to fertiliza- 

 tion (highly magnified). 



stalked cell and produces eight eggs, each of which is a fema*le sexual 

 cell. The eggs and sperm escape into the sea water. The eggs 

 float and are surrounded by myriads of sperms. One sperm, only, 



