154 ART. 12. K. YEXDO. 



spirally disposed. Those on the ultimate branchlets are some- 

 times replaced by vesicles, but very frequently no vesicle is to 

 be found in a frond. 



Vesicles, if present, are narrowly spindle-shaped, 2-4 times 

 longer than the diameter, attenuated towards both ends into a 

 filiform stalk and an awn. 



Receptacles are cylindrical, each with a short stipe at the 

 base. They are disposed in a short raceme on an ultimate 

 ramulet. Those on the terminal portion of a ramulet are gener- 

 ally simply geminate or solitary upon the petiole of a small 

 subulate, bract-like leaflet. 



Remark on the affinity. This species without doubt belongs 

 to the subgenus Racemosœ J. Ag. and should be placed near 

 Sargassum Henslowianum J. Ag. It resembles a form of 

 Sargassum hemiphyllum in general appearance as well as in having 

 the fibrous root. When fertile, however, each may be readily 

 distinguished from the other ; and when sterile, the present species 

 is easily recognized by the coreaceous texture of the leaves. 



Localities. Cape Shiomisaki, KiiProv. (!); Hiuga Prov. (!) 



ISHIGE^^ Gen. nov. 



Ishif/e Okatnurai sp. nov. 



Plate II. Fig. 1-8. 



=Pelvetia Babingtonii Ok am. (wee Harv.). Alg. Jap. Exsic. No. 37. 



— Id.: Enumer. Alg. Jap. p. 137. 



=Pelvetia Babingtonii Harv.? Yendo: Prelim. List of Jap. Fuc. 



p. 151. 



Diagnosis. Planta duabus formis; una forma radice scutellata rachide brevi 



tereti, mox expansa, fronde eomplanata, rcgulariter decomposite dicho- 



toma, flabellata, laciniis late linearibut*,' sursum latioribus, sinibus 



1) From the Japanese name of the plant. 



