104 AET. ]2. K. YENDO. 



or narrowly lanceolate ])ractlet. They are disposed in a raceme 



on the terminal portion of the ultimate ramulet. 



/. rnuticus form, no v. 



Diagnosis. Foliis inferioribiis majoribus, lanceolatis, ecostatis, minute dentatis, 

 superioribus ramulorumque cuneatis s?epe obliquis bi-tridentatis, medio 

 irregulari unica série cryptostomatibus glandulosis; vesiciilis obovatis 

 muticis rarius mucronatis. 



Remark on the forma. What has been said above on the 

 type may in large part be applied to the present forma. The 

 essential points separating it from the type are the leaves of 

 yonng sterile branches and the shape of the vesicles. The leaves 

 on the basal portion of a young frond are lanceolate, ribless, and 

 minutely serrated or coarsely dentated. They often attain 2cm. 

 in length and 5 mm. in width. The leaves on the upper ramules 

 are bi-tridentated, cuneated and frequently subhemiphyllous, with 

 minute cryptostomata irregularly disposed along the median line. 

 Vesicles are mostly obovate, muticous, but in rare cases some in 

 an individual are aristated or mucronated, and frequently spotted 

 with a few cryptostomata. 



This forma is limited, as far as our collection extends, to the 

 warmer parts of the Pacific side of the Main Island. The typical 

 form seems to exist in the colder seas only. 



Remark on the affinity to other species. The plant has 

 apparently a close resemblance to Sargassum hemiphijllmn in its 

 general aspect and texture, but it may be readily distinguished 

 from the latter species by its sirnj^le scutate root and by the 

 greater elongation of the ultimate ramulets. 



J. Agardh describes a plant from Hakodate, collected 

 by Kjellman, under the name of Sargassum corynecarpuni 

 Harv. I am in considerable doubt about, his plant. He says'^ 



]) Anal. Alg., Cont, Til. p. 57. 



