34 AKT. 12. — K. YEXDO. 



spicigera Ag. is a doubtful plant being described from an undoubt- 

 edly incomplete specimen : and lastly, Cyuophyllum Leindium 

 Harv. has no well marked character to separate it from Gißto- 

 l^hyllum geniinatum J. Ag. The remaining species Cystophyllum 

 crassi2yes J. Ag. and Cystophyllum filifolium J. Ag. have been 

 assigned to Japan and are more closely related to the plant here 

 described than to any of the others. 



Cydophyllimi crampes apparently stands close to the present 

 species especially when we compare the sterile specimens of both. 

 But the relative positions of the vesicles and receptacles readily 

 distinguish the two species. Cystophyllum filifolium J. Ag. was 

 formerly reckoned under the genus Cystoseira by C. Agardh. 

 This circumstance at first led me to identify our plant with that 

 species. But the characters of the vesicles and receptacles in the 

 diagnosis of Cystop)hyllum filifolium J. Ag. are rather nearer to 

 Cystophyllum crassipes J. Ag. than to the present species. 



So far as our present researches extend we can not find any 

 other species than Cystophyllum crassipes and the present one, 

 that approaches the description of Cystophyllum, filifolium J. Ag. 

 It may be permissible to say that the last mentioned S2:)ecies may 

 be identical with either of the two species mentioned. At present, 

 however, I must leave J. Agardh's species in doubt, with the 

 hope that some one wlio has an opportunity of examining the 

 original specimen, will carefully compare it with the two species 

 described in this paper. 



Remark on the generic position of the present species. So 

 long as the definition of the genus Cystoseira remains as it is 

 now, the plant here described ought to be counted under that 

 genus. In the preliminary list of the Fucaceœ of Japan, I^^ 



1) Ykndo: 1. c. p. 15"J. 



