126 AET. 12. — K. YENDO. 



edges of the stem and traverse longitudinally up to the next 

 node. Hence the edges are usually remarkably winged. 



From the upper surface of the stipulated portion of a petiole 

 a pair of opposite leaves start out. These leaflets are almost 

 sessile and have a common insertion. From a point practically 

 between the pair a lateral branch is given off. In comparison 

 with other species these two leaves represent two unusually con- 

 tracted basal nodes of a lateral branch. In the upper portions 

 of a frond one of the pair is found at the base of the branch 

 and the other a little above the first, but set in the opposite 

 direction, thus clearly proving the above remark. 



The leaves, except the basal ones, are dotted with prominent 

 cryptostomata. In some specimens, however, this character is 

 slightly developed, showing a gradual approach to var. typica. 



Remark on the affinity. J. Agaedh at first doubted the 

 validity of Halochloa micracantha Kutz. and referred it to Sar- 

 gassum Fengeri, though with hesitation. In Anal. Alg. Cont. 

 III. p. 52 he changed his former opinion and mentioned Kütz- 

 ing's plant as a distinct species under the genus Sargassum. He 

 further noted that the species stands close to both Sargassum 

 Horneri and Sargassum tortile. 



In describing Sargassum micracaîithum, J. Agakdh mentions 

 the wings on the stems and the cryptostomata on the leaves as 

 important characters. These are very pronounced in var. stij^ulata 

 while almost negligible in var. tyjyica. One of the specimens 

 collected by Dr. Y. Yabe on Tsushima Island was wingless on 

 the stem and showed every other character of var. typica, but 

 had well-defined cryptostomata on the laciniai of the leaves. 



That the resemblance of the preso^nt species to Sargassum 

 Horneri, Sargassum filicinuM, Sargassum tortile, etc., is merely 



