58 
FUCACEiE. — Sargassum. 
IV. 
Hab. On rocks and stones near low-water mark. Perennial. Summer. Com- 
mon on the Florida Iveys ; thrown up from deep water abundantly at Key West ; 
growing within tide marks at Sand Key. At Green Port, Long Island, Prof. 
Bailey. Also at Seaconnot, Bristol Ferry and Stone Bridge, 'Rhode Island, Prof. 
Bailey , and Mr. Thurber. Narragansett Pier, Newport, and Seaconnot Point, 
Rhode Island, Mr. S. T. Olney (v. v.). 
Stem from one to two feet long or more, generally undivided, hut densely clothed 
throughout its length with lateral branches, the lowermost of which are longest, the 
upper gradually shorter, and those near the summit but rudimentary ; terete, from 
a quarter to half a line in diameter, unarmed, and usually quite smooth. Branches 
similar to the main stem, either leafy, or furnished with a set of alternate secondary 
branches, similar to the primary. Leaves of a thickish substance and coriaceous 
texture, having many evident glandular pores, sharply serrate, or rarely repando- 
dentate or subentire : slightly narrowed at the base, and usually tapering to the 
point, but very variable in size, and in proportionate length and breadth ; sometimes 
oblong, sometimes linear-lanceolate, and sometimes broadly lanceolate : furnished 
with a strong, perc.urrent mid-rib, which becomes less evident just below the apex. 
Air-vessels numerous, particularly on the upper branches, and beneath the fructifi- 
cation, spherical, pointless, (or rarely with a small mucro), from two to three lines in 
diameter, raised on compressed or flattened, sometimes winged petioles of their own 
length. Receptacles axillary, linear, repeatedly forked, shorter than the subtending 
leaf, tnberculated. Colour varying from a dark, brownish olive to a foxy or tawny 
bay. Substance tough and leathery. 
2. Sargassum Montagnei, Bailey MSS. ; stem filiform, slender, smooth ; leaves 
very narrow, linear-lanceolate, attenuate, repando-dentate or subentire, ribbed, 
pale-greenish olive, membranaceous, glandular-dotted ; air-vessels spherical, fur- 
nished with long, filiform or foliaceous points, raised on square petioles of their own 
length ; receptacles axillary, tnberculated, more or less forked, and generally 
shorter than the subtending leaf. — (Tab. I. Fig. A.) 
Hab. On rocks and stones, near low-water mark. Perennial. Summer. At 
Greenport, Long Island, growing with S. vulgare , Prof. Bailey and W. PL. H. ; 
Little Compton, Rhode Island, Mr. Olney (v. v.). 
Root a conical disk. Radical and primary leaves oblong or lanceolate, 2-3 inches 
long and 3-4 lines in diameter, sharply serrate or unequally dentate, membrana- 
ceous. Stems from two to three feet long, filiform, smooth, very slender, undivided, 
set throughout with lateral branches, the lowest of which are twelve or fourteen 
inches in length, and the upper gradually shorter and less compound. The longer 
branches give off alternate branchlets, at intervals of half an inch to an inch. 
Leaves of the branches very narrow, usually two inches or more in length, and only 
a line or two in breadth, linear-lanceolate, attenuate, sometimes nearly entire, 
