74 



Vol. XLIII, Art. 1.— K. Yendo; 



from the blade of Eisenia are certainly most important " in generic 

 consideration of the Laminariaceae. Upon this ground Eisenia, 

 EcUonia and Undaria are associated in the snbtribe EckIonia3 under 

 the tribe Alariideœ. If so, the marginal outgrowths of Eisenia 

 and Ecklonia must be first compared witli those of Laminaria 

 radicosa Kjellm. The latter species shows in several points a 

 certain affinity witli Hirome and Undaria, and more indirectly with 

 L. Pefersemana Kjellm. The relationship between Eisenia and 

 Alaria, if any, should be considered as most indirect, placing 

 Laminaria radicosa, Hirome, and Undaria between them. 



1 ^ 



Eisen'ia & Ecklonvi L. radicosa 



Pkrijfjoiihora 



A series of diagram.itic figures to show the varieties of localization of sori 

 in varions genera of Laminariaceœ. 



Synoptical Key to the Species. 



1. Matured sporophylls entirely soriferous I. Holosoria. 



A. Midrib interruptedly hollow A. fistulosa P. et E. 



B. Älidrib thoroughly solid. 



« Blade finely corrugated in the upper part. 



Sporophylls dropped with petioles . . A. macroptera (Eupe.) 



