190 



THE ALGAE 



gametophyte are usually terminal. The ovum is fertilized on emer- 

 gence from the pore of the oogonium and the young sporophyte 

 develops in situ without the characteristic early appearance of a 

 holdfast. 



Alariaceae: Egregia (outstanding). Fig. 109 



This genus is composed of at least two, and probably more, 

 species, one of the major species having a more northern distribu- 

 tion than the other, though the genus is confined to the waters of 

 the Pacific between Vancouver Island and lower California. The 

 whole plant can be regarded as an extension of the Alaria type in 



Fig. 109 Egregia menziesit. ]A-C, stages in growth of young sporo- 

 phytes ( X iV). D, young frond. E, base of mature frond. F, apex 

 of mature frond. G, mature plant. (A-C, after Griggs; D-G, after 



Oltmanns.) 



190 



