THE FUGACES OF JAPAN. 79 



the author confesses, had none of their parts in a complete state. 

 Savffassiwi spathulatum was first noted from an upper portion of 

 a frond. He afterward found a lower portion of a frond that 

 he believed to belong to the same species, which, in my judge- 

 ment, was a local form of Sargassum Horneri apparently ditîërent 

 from the sterile but normal specimen he ever posessed. The 

 confusion has probably arisen from his ignorance of the complete 

 form of the present species. 



/. fuvcatodentattirti O'Kuntze. Plate X. Fig. 8. 



Revisio von Sarg. p. 224. PI. II. fig. 25. 



Remark on the forma. I have mentioned above that when 

 found in a warmer and more sheltered sea the plants assume a 

 changed appearance. The essential and only difierence between 

 such plants and the typical form lies in the basal leaves of the 

 young stems as well as in those of the sterile branches. They 

 are much smaller in size and membranaceous in texture; deeply, 

 alternately pinnately sected clear to the midrib throughout their 

 whole length; the pinnœ, except those of the lowermost leaves, 

 are narrowly linear, once or twice dichotomously or digitately 

 divided, with each apex pointed and curved inward, the spinous 

 processes along the upper surface of the rib being very conspic- 

 uous and almost always present. These characters are also 

 manifested in some degree in the fulcrant leaves and the crown 

 leaflets. The vesicles are usually proportionally small. This form, 

 although it gradually approaches the ordinary forms through 

 several intermediate stages, is by no means negligible. It is worth 

 mentioning in a formal rank. Forma furcalodentatum O'Kuntze, 

 1. c, suggests the jDresent form, and the photographic print accom- 

 panying the original paper illustrates an upper portion of it. 



