Tin: FUCACE^ OF JAFAX. O 



applicable to several entirely ditterent species. It must jje 

 confessed that the most puzzling points in the course of the 

 present study lay in such descriptions and their derivations. As 

 will be found in this paper, among the 39 species of Sargassmii 

 hitherto annexed to the Japanese algal flora only 18 seem to 

 me to remain as ** good " species. 'Jlie accompanying plates, 

 superfluous as some of them may seem, will give no small 

 advantage to those who may hereafter touch upon the Fucaceœ 

 of Japan. 



The morphological characters of Sargassuni have been 

 minutely discussed by ,1. Agaedii in "Species Sargassorum 

 Australia?," and few points need further remark. His observa- 

 tions, however, seem to me, undoubtedly to have been based 

 upon herbarium specimens. Close observation of the plants ui 

 ■vivo may reveal interesting and important facts to amplify or to 

 modif}" his conclusions. vSome points which are directly connected 

 •with Japanese forms will be noted in the present paper under 

 the species concerned. 



Among the members which are grouped in the series Acanlho- 

 cm'picœ J. At;, and Jlalacocarjncœ J. Ag. under the subgenus 

 Eiisargassiuii J. Xg., there are not a few species which cannot 

 be separated from one another without a knowledge of the 

 reproductive organs. Gkunow^' seems to have believed that 

 tiargassum polycystum is a dioecious plant with smooth male 

 receptacles and prickly female ones. If the presence or absence 

 of the prickly processes on the receptacle be due to the sex, 

 then there is no reason for separating the ÄcantkocarpicLü from 

 the Malacocurpico'. This question, however, is not yet satisfac- 

 torily settled. The plant which I have identified as Sargassum 



1) Forscliungsreise der Gazelle, p. 2(1. 



