Dr. Greville on some new species of Sargassum. 107 



dentatis, unlnerviis ; vesiculis sphaericis breviter petiolatis ; recep- 

 taculis minutis, axillaribus, cylindraceis, oblongis, inerraibus, sub- 

 racemosis. 

 Hab. in mari Peninsulas Indise Orientalis ; Shuter (1827), Wight. 



Root an expanded cartilaginous disc. Stem cylindrical, very 

 short (in the only specimen I possess scarcely half an inch), about 

 the thickness of a blackbird^s quill, muricate. Primary branches 

 few, 12-18 inches or more lonr, simple or sparingly divided, flat, 

 a line or more broad, giving off the secondary branches in a 

 distichous manner at intervals of about half an inch ; these are 

 from 3 to 6 inches long, and closely set with fruit-bearing ramuli 

 likewise distichously arranged, and from half an inch to an inch 

 in length. Leaves; those of the young primary branches, 

 especially near the base, an inch long, ovate-oblong, sometimes 

 ovate-lanceolate, somewhat undulate, deeply, and very irregularly 

 inciso-dentate ; those on the secondary branches half the size 

 above-mentioned, and those accompanying the fructification mi- 

 nute and somewhat cuneate; all furnished with a slender nerve 

 becoming faint and disappearing before reaching the apex, and 

 with abundance of oval pores. Vesicles spherical, on stalks 

 scarcely a line long; those accompanying the leaves on the 

 young primary branches considerably larger than the seed of 

 Lathyrus odoratus ; those on the smaller branches and those inter- 

 mixed with the receptacles much less. Receptacles axillary, about 

 a line long, cylindraceous, linear- oblong, obtuse, unarmed, form- 

 ing irregularly divided clusters. Colour a rich red-brown, the 

 younger leaves paler and somewhat translucent. Substance mem- 

 branaceous, slightly rigid when dry. 



This species is allied to Sargassum incisifolium, Ag., found at 

 the Cape of Good Hope, but differs in the entire receptacles be- 

 sides other characters. In an old state the branches lose their 

 leaves and seem covered with the little tufted racemes. 



The specimen which I possess from Dr. Shuter was kindly 

 communicated by Sir W. J. Hooker. 



11. Sargassum elegans (nob.); caule filiformi, teretiusculo, ramosis- 

 simo ; foliis lineari-oblongis, obtusis, laciniato- dentatis, inferne 

 oblique attenuatis ; vesiculis parvulis, sphaericis ; receptaculis li- 

 neari-oblongis, subcompressis, apieem versus dentatis, racemosis. 



Wight in herb. no. 15. 



Hab. in mari Peninsulae Indiae Orientalis ; Wight. 



Plant probably between 1 and 2 feet long ; the specimen before 

 me being fully 12 inches of the upper extremity, the whole of 

 which bears evidence of having been covered with branches. Root 

 I have not seen. Stem, or probably more correctly primary 

 branch, filiform, about double the thickness of a hog's bristle. 



