Dr. Greville on some new species of Sargassum. 505 



aribus, attenuatis; vesiculis parvis, ovalibus, muticis, tuberculatis; 



receptaculis rainutis, racemosis, axillaribus, cylindraceis, oblongis 



vel oblongo-cuneatis. 

 Hab. in mari Peninsulae Indise Orientalls ; Wight. 



Root a small callovis 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 foliaccous, 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 t6 

 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. Fe^zc/es 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 cauHnis 

 linearibus, inciso-serratis, ramis angustissime linearibus, serrato- 

 dentatis ; vesiculis spheericis, petiolatis, petiolis filiformibus ; re- 

 ceptaculis cylindraceis, lineari-clavatis, in racemo laxo dispositis. 

 Sargassum august if olium, Ag. Sp. Alg. vol. i. p. 32 ? 

 Hab. in mari Peninsulse Indite 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 3—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 



