134 AET. 12. — K. YENDO. 



^=Sargassum eristœfoUum var. eondensatum Sond.: Alg. Trop. Austr. 



p. 42. No. 15. 

 "^ = Sargassinn dublicatum Okam.: Enumer. Alg. of Jap. p. 153. 



Remark on the species. Numerous specimens of marine 

 algaî were brought liome by Dr. H. Hattori of the Botanical 

 Institute, collected by himself while on a trip to the Bonin 

 Islands. Among them there are a good number of Sargassum, 

 all fertile and complete. After careful examination they all proved 

 to belong to a single species, to which the descriptions and 

 figures of Sargassum beriberifolium given by J. Agakdh in the 

 paj)ers above referred to were exactly applicable. As the estab- 

 lisher of the species seems not to have had access to a complete 

 specimen, some additional remarks on the points which escaped 

 his observation will not be superfluous. 



The root is disc-shaped in a young and isolated individual 

 but is usually prostrate, sometimes overlapping the surface of a 

 LithothcminicG and eventually assuming a hemispherical or tuber- 

 culate shape of irregular outline. On its upper surface there 

 stands in most cases several principal stems which are cylindrical, 

 smooth and hardly a centimeter in height. A number of 

 principal branches are sent out in all directions around the 

 short stem, frequently apparently multicipitally. These branches 

 play the important part of frond and attain 3-4 feet in length 

 when fully developed. 



The stem of a principal branch is complanated, giving rise 

 to the lateral branches on its ancipitous margins distichously 

 and alternately. But as the stem is generally more or less 

 loosely twisted the arrangement is in some degree disturbed. 



The leaves on the lower portions of the principal branches are 

 elliptical or oblongo-obovate, evanescently costated, and sharply 



