THE FUCACEiE OF JAl*AN. ßl 



leaves are in like manner decompoundly pinnately divided, but 

 the segments are thick, filiform and ribless, cartilaginous in 

 substance and frosted with conspicuous cryptostoraata on the 

 surface. The young branches are morphologically similar to the 

 basal leaves and may further develop into long branches by the 

 thickening and elongating of the axial segment. 



One or two lateral branches start out from each axil of the 

 middle and the upper leaves. The lower lateral branches 

 measure 20 cm. or more, the lowest being the longest. The 

 leaves on the branches are essentially like the fulcrant leaves 

 but the number of segments gradually decreases. The leaflets 

 on the terminal portions of the ramulets are mostly simple 

 and setaceous. 



Vesicles are sjDhserico-obovate, round at the apices, and have 

 stipes as long as the vesicles. Those in the lower portions of the 

 fronds lack the cryptostomata but those in the upper are evidently 

 spotted with conspicuous ones. They are mostly found solitary 

 near the insertion points of the branches or branchlets. 



Fertile ramulets are found at the axil of the simple seta- 

 ceous leaflets in the terminal portions of the lateral branchlets. 

 The receptacles are cylindrical, somewhat pointed above, verru- 

 culose on the surface, and with a short stipe. 



Remark on the affinity. The present plant exhibits close 

 similarity to ^Sargasmm 'piluliferum and its variety. On the 

 other hand, it has no less resemblance to the plant reported 

 from the Californian coast under the name Sargassuni piluliferum. 

 This species, however, is, in the well grown individuals, easily 

 distinguished from the others by its having ribless, filiform 

 leaves. 



Locality: Kashiwajima, Tosa Prov. (!). 



