A aionograpli of the Genus Alarin. 45 



the species invostigated, very probably in all members of the 

 Laminariacese, there is an alternation of generation with the con- 

 spicnous asexual form and the microscopic sexual. 



When P) described Hlrome undarioides as a new species, I 

 expressed the view that the plant stands as an intermediate form 

 between Undaria pinuatifida Sur. and Laminaria mrf/cosa K.jellm., 

 in its habit, texture and propagating organs ; and that an explana- 

 tion of the genetic relationships between them may be facilitated 

 if hybrids of Laminariaccous species have been proved possible, 

 tn the specific determination of other members of Laminariacese 

 Ihe same is to be observed. The late discovery is from this point 

 of view highly interesting and important. 



The early embryonal stages of the fronds of the Laminaria - 

 ceous plants have also been carefully studied by Deew,^) and by 

 KiLLiAN^) on Laminaria digitata, by Sauvageau*) on Laminaria 

 saccharina, and by myself^) on Costaria Turncri md Undaria pin- 

 uatifida. Of the later stages, there are works by Barber,^) Set- 

 CHELL,^) Reinke,«) McMillan,^«^) GRIGGS,^«) Kylin,ii) gtc, OU various 

 species. By these studies our knowledge on the development of 

 the frond of Laminariacea? has been much amplified than in before. 

 There remain, however, some points for further study on the life 

 history of various species, if not of the majority. The question 



1) Yendo : Three New Mar. Algae from Japan, p. 102. 



2) Deew : Eeproduclion and Early Development of L. saccharina and L. dvjUaia. 



3) KiLLiAN : Beiträge zur Kenntn. der Laminarien. 



4) Sauvageau : Sur les Plantiües de quelq. Lam. 



5) Yendo : Development of Costaria, etc. 



6) Baebee : On the Stnacti;re and Development of the Bulb in L. hulbosa. 



7) Setchell: On the Life History of Sacchnrhim. 



8) Reinke: Studien z. vergleich. Entwicklungsgeschichte der Laminarien. 



9) Mc^Mii.LAN : Observation on Ptery^ophora. 



10) Geiggs: -Juvenile Kelps and the Recapitulation Theory. 



11) Kylin: Über den Generationswechsel bei laminaria digitat t. 



