58 rUCACE^.— Saegassum. iv. 



Hab. On rocks and stones near low-water mark. Perennial. Summer. Com- 

 mon on the Florida Keys ; 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. Thurher. 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, but 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 

 l^oint, but very variable in size, and in proportionate length and breadth ; sometimes 

 oblong, sometimes linear-lanceolate, and sometimes broadly lanceolate : furnished 

 ■with a strong, percurrent 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 tA¥o 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, tuberculated. 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, tuberculated, 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. H. 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 narro-\T, usually two inches or more in length, and only 

 a line or two in breadth, linear-lanceolate, attenuate, sometimes nearly entire. 



