Tin: FUCACE/E OF .TAFAX. 1 0,"> 



thiit it lioars a close reseniblanco to Sargassiim hemiphylluvi. 

 iSarf/assum. corijnecarpum, as already stated (p. 84), was established 

 by Harvky on a withered specimen of Sargassum scrratifoUwn. 

 Although J. Agardit had never seen an authentic specimen of 

 Hakyey's species, it is ratlier surprising that he should refer a 

 ]ilant which had some likeness to Sargassinn hemvphylhim to the 

 diagnosis of such a widely differing species as Sargassum coryne- 

 cnrpum Harv. Judging fiom the description given in Anal. 

 Alg. Cont. III. 1. c, his plant seems to come near the present 

 species, though it is said to have immersedly costated leaves and 

 apparently fibrous roots. In our plant the root is small and 

 scutate. But when the basal stem is greatly diminished in 

 length, the adventitious buds from the lower portions of the 

 main branches give the appearance of a fibrous root. The basal 

 leaves in our plant, again, are frequently evanescently elevated 

 on the meridional line, but the upper ones are decidedly ribless. 

 It is with some hesitation that I refer the present species to the 

 plant that J. Agardh mentioned under the name of Sargassum 

 corynecarpum ; it may, however, be safely stated that his plant 

 is remote from Harvey's, but is closely related to the species 

 here described, if not identical with it. 



Sargassum Tliunbergli f. latifolia is closely allied to the 

 present species. The young shoots of both, indeed, are almost 

 indistinguishable the one from the other. When fully grown, 

 however, both exhibit several characters which enable us to 

 separate them quite easily. In the present species the leaves on 

 the upper ramules are cuneate, bifid cuneate or often linear- 

 lanceolate, but rarely filiform; the vesicles have longer and more 

 delicate stipes; and the vesiculiferous ramulets are not abbreviated 

 as in Sargassum TJmnhergii. The young and sterile specimens 



