120 AET. 12. K. YEXDO. 



accurate and often quite unreliable. Kützing^^ illustrates some 

 of the leaves as having two inflations successively or in a series. 

 The greater number of the typical forms of the present species, 

 when fully grown, have this sort of vesicles. I am tempted to 

 believe that this character is rather important in tlie discrimi- 

 nation of tlie two species. Besides, this species may be easily 

 distinguished from the preceding by its yellowish colour and soft 

 texture. The fulcrant leaves are mostly as broad as, or broader 

 than, those of /. latifolia and are spotted with a few well defined 

 cryptostomata. In some specimens I found the basal leaves 

 slightly dentated with the general outlines linear-lanceolate. It 

 must be remembered, however, that given the young fronds alone, 

 it is usually difficult to distinguish the present species from the 

 preceding except with practice. 



The occurrence of two inflations serially in a leaf is an 

 uncommon charactei* among the species of Sargassum. The same 

 sort of arrangement of vesicles has been met with in several 

 species of Cystophyllum. This fact made me hesitate to refer 

 the present species to the genus Sargassam. But the receptacles 

 are, as in the preceding species, evidently axillary, which, in 

 the limitation of Cystophyllum by recent botanists, proves the 

 iniproj)ricty of the generic jiosition hitherto acknowledged. 



Localities : " Pacific side, from Kiuslui to the southern 

 part of Hokkaido."' (Okamura) ; Takashinia, Shiribeshi Prov. 

 (h.s. A.); Sawara (ii. ii.f.), Osatsube (h.h. f.), Oshima Prov.; 

 Shiretoko, Kitami Prov. (h. h. v.) ; Enoura (h. sc. coll.), Izu 

 Prov.(!); Shima Prov. (!). 



]) Tai). I'll VC. X. T:.f. 9;î. Hi;. 1. 



