THE FUCACEiï: OF JAPAN. 135 



but eojirsely subdiiplicately dcntatcd on tlic margin. Some of 

 tlic leaves on the lateral branches are evidently " duplicated " 

 while the larger number of them are simple. 



Vesicles are spherical with a complanated stipe as long as 

 their diameter. In the majority of cases those on the lower portion 

 of a frond are marginated or even have coarsely dentated wings. 



Remark on the synonymy. J. Agakdh^^ has referred Sar- 

 gassum cristccfolium var. condensatum Sond. and Sargassum 

 dvplicatum Boky to the present species though with hesitation. 

 On comparing our plant with a specimen of the former variety, 

 determined by GßUNOW, it seems to me that J. Agardh had 

 good grounds for doing so. As for Sargassum du2'>licatum Bory, 

 Major Keinbold wrote me that it is very likely a species 

 distinct from the present. 



Mr. Okamuka reported Sargassum duplicatum J. Ag. to 

 have been collected in the Bonin Islands. Dr. Hattori observed 

 that no other species seemed to occur there beside that which 

 he had collected. It is not impossible that there occurs Sargassum 

 Ilicifolmm var. dublicatum, which may have been mentioned by Mr. 

 Okamura under the name Sargassum duplicatum J. Ag. At pre- 

 sent, however, I can only mention his statement here, though I 

 doubt if his plant can be identified with Sargassum beriberifolium. 



Locality. Bonin Isl. (Hattori), ? (Okamura). 



Tribe 3. BISERRULuE Ag. 

 Sargassu^n Iwterocystum Mont. 



Cent. III. No. 54.— M: Yoy. Bonite, p. 43. Tab. 142.— J. Ac: Spec. 

 Alg. I. p. 34G.— /f/.: Spec. Sarg. Austr. p. 93.— De Toni: Syll. Alg. 

 III. p. 55. 



1) Spec. Sarg. Austr. p. 90 and 123. 



