4 AKT. 1-'. — K. YENDO. 



Iiic(foliiim var. duplicatuiiL in tbe present paper liud some of its 

 receptacles quite smooth and some undoubtedly prickly ; and a 

 male plant referable, though not without some hesitation, to the 

 same species is provided with prickly receptacles. These facts 

 seem to disprove Gkunow's remark. 



O'KuNTZE revised the Sargassuyn species in 1881^^ and in 

 1898.'"' In so far as it relates to the Japanese species his view 

 is so divergent from that of the systematists of the present day 

 that I can not venture to follow his specific arrangement. He 

 seems to have taken the relative positions of recej)tacles, vesicles, 

 and leaves in an individual as characters of little importance 

 in defining a species. As a result, some of the members of 

 Cystojjhyllum in our classification are b}^ him I'efei'red to Sar- 

 gassum. I have therefore found it advisable not to take his 

 opinions into consideration in the i)resent work except on one 

 or two points. 



The present study was first suggested by Dr. K. Kishinouye 

 of the Imperial Fisheries Bureau of the Department of Agricul- 

 ture and Commerce. In 1902, circulars were sent to twenty 

 two Marine Experiment Stations along our coasts, request- 

 ing the collection of specimens of Sargassuvi and its allies. 

 Numerous specimens of the genus mentioned as well as of 

 Cydophyllum, etc., all entire and perfect, were sent to the 

 Bureau. The material was examined carefully together with the 

 dried specimens in the writer's herbarium. For certain reasons 

 the study could not be carried on under the J^ureau and all of 

 the material was entrusted to the writer for the execution of 

 the work. 



1) Revision voii iSiirgassum u. das sogenannte Sargasso Meer. Englek's Bot. Jalirb. 

 ]',d. 1. ISSl. 



•J) lievisio (icncra I'lantarum. 111. ii. 



