88 ART. 12. K. YENDO. 



ancipitous, often with a few spines along the margins. In tlie 

 upper portions of the more developed branches, however, they 

 become triquetrous and are often very strongly twisted. The 

 stems of the fertile branchlets are slender, filiform and triquetrous 

 or terete. 



Vesicles are mostly found solitary near the base of the 

 terminal raraulets. They are pear-shaped, often subspherical, 

 mucronated at the apex or with a setaceous crown leaflet, and 

 with a short, slender, cylindrical stalk. In a specimen kindly 

 given me by Mr. K. Tsuge, who collected it in the province of 

 Wakasa, the setaceous crown leaflets are so very pronounced as 

 to give a piluliferous appearance to the upper portions of the 

 frond. Frequently the aj^ex is crowned with an alternately 

 pinnately serrated, filiform leaflet. The size of a vesicle varies 

 according to its position in the frond, but the largest ones 

 measured 1cm. in length and 0.8-0.6 cm. in diameter. 



Vesicles are in most cases not met with in the young 

 branches but are found abundantly on the upper portions of the 

 full grown but sterile fronds : in April, when the plants become 

 fertile, the fronds are very poor in vesicles as they are mostly 

 given off in this season. 



Receptacles are linear-spa thulate, clavate or elongato-elliptical, 

 compressed with round margins, more or less attenuated below 

 ending in a short cylindrical stalk. They are disposed in a 

 raceme on a final ramulet with a filiform, simple setaceous 

 bractlet at the base of each. The bractlets easily drop off and 

 often no trace of them is to be found on the frond, except their 

 insignificant scars. The result shows an apparent similarity to the 

 receptacular ramulets of the members of.- the section Siliquosœ 

 under the Eusargassum J. Ag. 



