72 ^'ol- XLITI, Art. 1.— K Yendo : 



the morphological characters. Since that time there have been 

 added numerous species and genera to the family, counting today 

 29 genera including a few questionable or critical ones. Extended 

 observations on the anatomy and the development of the frond have 

 thrown much light on the family. Setghell's classification re- 

 quires, therefore, additions and amendments on various points. 

 Keinke's Studien zur vergleichenden Entwicklungsgeschichte der 

 Laminariaceen, though a highly interesting and instructive paper, 

 does not add much in this line to Setghell's view. According to 

 Setchell, and adopted by Keinke, Alaria is most closely related 

 to Pterygophora so that he has established for these two the sub- 

 tribe Alarie£e under the tribe Alariidese. Both are indeed sharply 

 distinguished from all other co- families by having the sori on the 

 leaflets situated upon the stipe alone. 



Under the same tribe Setghell included Undaria, EcUonia and 

 Eisenia group, under the subtribe Ecklonise. This classification is 

 undoubtedly derived from his iacomplete acquaintance of Undaria 

 at that time, as he complained of the difficulty of getting its 

 material for study. He also put too much stress on the marginal 

 outgrowtlis from the blade of Eisenia.^^ Recent observations on 

 Undaria by Okamura and by the present writer give ample evi- 

 dence that it has less affinity with EcUonia or Eisenia, while on 

 the contrary, the genus has a very close relationship with Alaria. 



The sori of Undaria develop on the wing-like outgrowths on 

 both edges of the stipe and nowhere else. Those outgrowths are 

 practically enormous extensions of the edges. The ruffle-like un- 

 dulations of the external margins result from the excessive growth 

 in length in the marginal parts. These undulated sporophylls, as 

 they are c alled, are at some distance below the transition region in 



1) Setchell: Post -Embryonal Stages of Laminariacea?, p. 129. 



