es oS CN te Sa eS 
Dr. Greville on some new species of Sargassum. 107 
_ dentatis, uninerviis ; vesiculis spheericis breviter petiolatis ; recep- 
’ taculis minutis, axillaribus, cylindraceis, oblongis, inermibus, sub- 
racemosis. 
Hab. in mari Peninsule Indiz 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 lonz, 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 setewith fruit-bear ing 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 regularly 
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 
‘sae i leaves paler and somewhat translucent. Substance mem- 
ranaceous, 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, spheericis ; receptaculis li- 
neari-oblongis, subcompressis, apicem versus dentatis, racemosis. 
Wight in herb. no. 15. 
Hab. in mari Peninsule Indie 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, 
