Ser. MELANOsPERMEiE. - Fam. Fucacece. 



Plate CCVIII. 



SARGASSUM LACERIFOLIUM, A^. 



Gen. Char, Root scutate, i^rowr/pinuatelj decompouncl, with distinct stem, 

 branches, leaves, vesicles, and receptacles. Vesicles stipitate, supra- 

 axillary, simple, most frequently mucronate or leaf-bearing. Recep- 

 tacles pod-like, torulose or moniliform, axillary. Scaphldia dioecious. 

 Spores obovoid. — Sargassum {Jg.), from the Spanish sargazo, a name 

 give by navigators to floating seaweed. 



Radix scntata. Frons innnatim decomposita, caule propria, ramis,foUis, vesi- 

 cnlis receptaciilisque donata. VesictdcE stipitatce, supra-axillares, simplices, 

 sapissime mucronatce v. foliiferce. Receptacula siliquaformia, torulosa v. 

 nodulosa, axiUai'ia. Scaphidia dioica. Sporce ohovoidece. 



Sargassum lacerifolmm ; stem sharply 4-sided ; branches bent back at 

 their insertion, issuing from the flat side of the branch ; leaves of 

 two forms, the lower lanceolate, deeply inciso-serrate, ribbed, the 

 upper very narrow, nerveless, remotely but sharply serrate ; vesicles 

 ovoid, wing-bordered and tipped with a leaf; receptacles oblong, 

 3-angled, the prominent angles serrate, racemulose. 



S. lacerifohum ; caule tetragono ; ramis ad ortum retrofractis e latere piano 

 egredientibus ; foliis dimorplds, inferiorihus lanceolatis profiinde inciso-ser- 

 ratis costatis, superioribus angustissimis enerviis remote argute serratis ; vesi- 

 culis ovoideis alato-marginatis folio coronatis receptaculis oblongis triquetris 

 iristiche serratis racemulosis. 



Sakgassum lacerifolium, Ag. Sp. Alg. p. 15 ; Syst. 298. /. Ag. Sp. Alg. 

 V. \. p. 300. Harv. Alg. Exsic. Austr. n. 20. 



Carpacanthus lacerifolius, Kiitz. Sp. Alg. p. 634. 



Fucus lacerifolius, Turn. Hist. Fuc. t. 167. 

 Hab. Port Dairy m pie, Tasmania, R. Brown. King George's Sound, 



rare, W. H. H. 

 Geogr. Distr. South-west of New Holland. Tasmania. 



Descr. Root . . . Stem 2-3 feet long or more, 1-1^ lines in diameter, 4-angled, 

 with sharply projecting angles, flexuous, pinnately decompound. Branches 

 reflexed at their insertion, springing from the flat side of the stem, 6-12 

 inches long, diminisliing upwards, angularly bent, 4-angIed like the stem, 

 or almost winged ; the larger ones pinnated with a second series of similar, 

 but smaller branches. Leaves of two kinds ; those at the base of each branch, 

 or of each division of a larger branch, lanceolate or linear-lanceolate, 2-4 

 inches long, 3-6 lines wide, midribbed, without glandular pores, deeply 

 and sharply inciso-serrate or lacerate. The upper rameal leaves, and those 



