THE FUGACES. OK JAPAN. 63 



laminn, ninniiip; into each sc2;nicnt. The margin of the leaves 

 usually has a tVw sharp dentations but often is quite entire. In 

 one specimen collected at Misaki, all of the leaves were entire; 

 while in another, the leaves on the basal portions were entire 

 but those on the upper had become dentated. The total length 

 of a leaf measures 3-5 cm. No cryptostoma were found on the 

 leaves. 



The leaves on the upper branches are thin and membra- 

 naceous. They are essentially similar to the lower ones in shape 

 but attain a much larger size, often measuring 8 cm. in length, 

 and 4 cm. in maximum breadth. They are occasionally decom- 

 poundly pinnately sected and the margin is mostly dentated. In 

 the specimen from the Hiroshima Higher Normal School the 

 apices of the segments are obtuse but in the Loochoo specimens 

 they are generally acute. The cryptostomata are small but 

 evident, and are arranged in an irregular series on each side of 

 the lamina. 



Vesicles are usually found solitary at the base of the lateral 

 branches or on the petiole of the fulcrant leaf of the upper 

 portions of a frond. They are oblong or sometimes sjiherical, 

 coronated with simple or bifurcated leaflets and with stipes 

 shorter than their diameter, which varies from 3 to 5 mm. 



Receptacles unknown. 



Remark on Relation to other species. Judging from the 

 photographs, the original specimens of Sargassum pijuiatißduin 

 Hary. were two different plants catalogued under the same 

 name. One of them is evidently equal to Sargassum patens var. 

 Schizophylla ; and the other, an upper portion of the present 

 species. Harvey did not distinguish them as separate species, 

 and the original diagnosis of Sargassum pinnatifolium seems to 



