206 BOTANICAL MAGAZINE. LVoi. xn. 



Thus the two plants are alike in every respect one another, except 

 that in Japanese form the branches are sliorter and the holdfast more 

 conical. These differences can not be clearly distinguished in the younger 

 forms and are by no means important enough to separate the both plants 

 into two species. 



It is clear that the adult form of Eel:, hicyclis has not been access- 

 ible to the author of Eisenia, and he probably thought the young form of 

 Eisenia collected in Californian coast to be EcJdonia. He mentions Japan 

 and California among the localities of EcJc. radiata (Turn) J. Ag : the 

 occurrence in tlie latter locality being doubted by Setchell'' and De Toni.^' 

 The Japanese specimen of his no doubt meant Ech. hicyclis and the 

 Californian, probably a young plant of Eisenia arhoria, as has been 

 already remarked by Setchell.^' 



Hence the writer is inclined to think it better to unite tVie both plants 

 into one species, reducing Ed:, hicyclis to a form oi Eis. arhoria., with 

 the characters above given ; calling it 



Eisenia arboria, Aresch. f. bicyclis (Kjellm). 



= Capea elongata, Martens, Preus. Exp. n. Ostas. Tange. p. 113. 



= Gapea flahelli/ormis, Martens. do. 



=EcMonia hicyclis, Kjellm. Om Jap. Lam. p. 269. tab. X, 



f. 4-5. 

 = Eckolnia radiata, (Turn) J. Ag. II rugulosa a pinnata, h. 

 Jlahellata et c. eloiKjata, Sur. Algues du Japon. p. 3. 



PI. XVIII— XX. 

 Aresch. Observ. Phycol. Part V. 

 p. 12. quoad spec. Jap. 

 Thus the two localities mentioned by Areschoug become true in a 

 sense and the plant hitherto been thought monotypic, limitted to Califor- 

 nian coast, has its sister at the opposite side of the Pacific Ocean. 



There is no doubt that Eis. arhoria f. hicyclis, as now it should be 

 called, is very closely related to Eck. cava, Kjellm. Consequently, Setchell's 

 view*) that Eiscjiia stands near Ecklonia rather than other genera of 

 Laninariacece becomes more sound than before. 



1). Classif. and Distrib. of Lam. p. 355 (Trans. Conn. Arad. Vol. IX 189.1). 



2). Sylloge algarum. Ill p. 354. 



3). Notes on Kelp. 1. c. p. 43. 



4), Classif. and DJstrit. of Lam. p. 349. 



