94 AET. 12. K. YENDO. 



leaves ascend, the number of the cryptostomata at the same 

 time diminishing. 



The leaves on the minor branchlets are narrow and filiform, 

 mostly with neither rib nor cryptostoma. 



Vesicles are j^yriform, with very short stipe at the base and 

 quite round at the apex. In some cases a few mucronated 

 vesicles are found among the muticous ones; and often an indi- 

 vidual with all the vesicles mucronated is met with. A specimen 

 from the Province of Izumo belonged to the latter category but 

 had exactly the same characters as the others in the remaining 

 points. As a rule two or three vesicles are found in a dwarfed 

 raceme at the base of the ramulet. No cryptostomata on the 

 vesicles. 



Keceptacles are elongato-conical, 3-5 mm. in length, obtuse 

 at the apices and with a very short pedicel at the base. They 

 are found, in matured plants, in dense racemose branchlets. 

 Excepting the few terminal ones, each of them is accompanied 

 by a small filiform, subulate and spotted bractlet. 



Remark on the identification. The descriptions and illustra- 

 tions of Sargassum fulvellum Ag. are largely applicable to our 

 plant, except in a few points. The jDallidity of the frond, which 

 characterized the species, has not been proved in our specimens. 

 The material on which the original description was based had 

 probably been bleached as J. Agardh^^ has already noted. In 

 defining the species C. Agardh^^ and Tuknee,^^ used the expres- 

 sion *' foliis enervibus." Our plant, however, has the leaves 



mostly evanescently costated except those on the terminal parts 



1) Spec. Sarg. Austr. p. öl. 



2) System, p. 30G. 



3) Turn.: Hist. Fuc. Vol. I. p. 147. 



