Tin: FUOACE-K OF J A PAX. 101 



iho^c on llio lower })ortiüns of a. IVoml are obovatu or j>yrirorin, 

 often willi round ai)iees, while on the upper they are elliptieal 

 or oblongo-obovate and niucronated at the apices. Frequently, 

 they appear like an inflated leaf with a wing-like appendage at 

 the margin. These variations occur sometimes in the same, 

 sometimes in dilVerent individuals. 



Receptacles are cylindrical, about 1mm. in diameter, o-Omm. 

 in length, more or less attenuated above, and abruptly ending 

 below in a short stipe. They are racemosely disposed at the 

 upper portion of the terminal branchlet. When the latter has 

 been much depressed they appear in a small cluster with a few- 

 vesicles at the base. A small, subulate bractlet accompanies 

 each receptacle except the terminal one. 



Remark on the synonymy. J. Agaedh distinguished two 

 varieties of Sargassam hemiphyllum Ag., calling them var. chinenëo 

 and var. niicromeruni in Spec. Sarg. Austr. 1. c. In his later 

 work. Anal. Alg., 1. c, he raised them both to specific rank. 

 A close examination, however, of rich collections of the plant 

 from various localities made at various seasons proves that the 

 characters pointed out hy J. Agardh to distinguish the three 

 species are not diagnostic, and that it would be better to unite 

 them into one species. The size of the leaves is, first of all, wholly 

 unreliable for specific or varietal distinction. It varies according 

 to the parts of the frond and also according to individuals. In 

 an aberrant form collected by myself at Cape Shiomizaki, in 

 the Province of Kii, I found the leaves on the lateral branches 

 nearly as large as the fulcrant leaves on the main stems. The 

 roundness or sharpness of the apices of the leaves is a much 

 more unfixed character. Frequently plants are found with leaves 

 decidedly entire at the margin and round at the apices. 



