Dr. Greville on some new species of Sargassum. 505 
. aribus, attenuatis; vesiculis parvis, ovalibus, muticis, tuberculatis; 
receptaculis minutis, racemosis, axillaribus, cylindraceis, oblongis 
vel oblongo-cuneatis. 
Hab. in mari Peninsule Indiz Orientalis; Wight. 
Root a small callous disc. Stem, in the single example before 
me, scarcely half an inch long, about as thick as a sparrow’s 
quill, tuberculated. The very young branches which arise from 
this are quite flat and foliaceous, the young leaves having at 
first the character of pinnatifid expansions of the frond, after- 
wards becoming ovate or elliptical. The old branches are 1-2 
feet long, compressed, about half a line broad, and begin to give 
off secondary branches several inches in length almost imme- 
diately, which in their turn bear a third series half an inch to 
an inch and a half long on which are produced the very short 
fertile ramuli. Leaves on the mature plant very numerous, an 
inch long or more, linear, attenuated, not half a line broad, quite 
entire, with a faint nerve and a few pores. Vesicles very nume- 
rous, oval, tuberculated with the prominent pores; those at the 
base of the small branches about a line in diameter; the rest much 
smaller; all supported on stalks 1-2 lines long, flat and very 
slender. Receptacles numerous, axillary, less than a line long, 
cylindraceous, oblong or somewhat cuneate, or partly divided, 
forming along with the vesicles a-minute, considerably branched 
raceme. 
A slender species, but well-clothed with branches, leaves, vesi- 
cles and fructification. It has a great resemblance in habit to 
S. concinnum, but differs widely in the fructification. 
21. Sargassum flexile (nob.); caule tereti, filiformi; foliis caulinis 
linearibus, inciso-serratis, ramis angustissime linearibus, serrato- 
dentatis ; vesiculis sphzericis, petiolatis, petiolis filiformibus; re- 
ceptaculis cylindraceis, lineari-clavatis, in racemo laxo dispositis. 
Sargassum angustifolium, Ag. Sp. Alg. vol. i. p. 32? 
Hab. in mari Peninsule Indiz Orientalis ; Wight. 
Root a callous disc, throwing up several stems, three feet or 
more long, terete, in my specimens not thicker than a sparrow’s 
quill, giving off branches 8-12 inches in length at intervals of 
1-2 inches. These branches bear a second series at short in- 
tervals, on which are situated the fruit-bearing ramuli. Leaves ; 
those arising from young shoots close to the root, sessile, oblong 
or linear-lanceolate, obtuse, quite entire, furnished with a strong 
nerve reaching to the apex, and very minute pores. The cau- 
line leaves, or those produced at the base of the primary branches, 
linear, an inch or more long, and above a line broad, somewhat 
acuminate, irregularly inciso-serrate, those towards the base of 
the stem more or less sessile. On the branches the leaves are 
about three-fourths of an inch long, a third of a line, or even still 
