subtending cacli tuft of receptacles very narrow-linear, sharply serrate, 

 either wholly nerveless or with an obscure, immersed or obsolete midrib, 

 1-1. J inches lonsc, i-l line wide. Fenicles few, one at the base of each 

 branch, or of e;ich division of a larger branch, on a flattened petiole, ovoid 

 or subglobose, with a narrow wing-like border, tipped with a nerved and 

 serrate leaf. Receptacles in alternate stipitate clusters of 2-3, each sub- 

 tended by a narrow leaf, ranged in quasi-racemes along the minor pinna?, 

 the subtending leaves deciduous ; each receptacle 1-2 lines long, thickened 

 upwards, blunt, 3-ridged, the ridges toothed. Spores mostly solitary in 

 each cavity. Colour brownish-olive. Substance coriaceous. 



This would seem to be a very rare, although a widely distri- 

 buted plant. Turner described and figured it from a solitary 

 specimen, picked up by Mr. Brown at the mouth of the Tamar ; 

 and my figure is taken from another solitary specimen, collected 

 by me in King George's Sound. Our figures, independently 

 made, are, I think, sufiiciently alike to show that we both aim 

 at representing the same specific form ; and I hope some of the 

 many collectors in Australia who are now looking after Alffce, 

 will pay a little more attention to the species of Sar^assum than 

 has hitherto been the case, and thus that we may ere long have 

 a satisfactory knowledge of the present well-marked form. 



Fig. 1. Sargassum lacerifolium, — the noiiiral size. 2. A vesicle, tipped 

 with its leaf. 3. Part of a leafy raceme of receptacles. 4. Cross section 

 of a receptacle. 5. A spore, — magnijied. 



