The range of D. viridis in the Northern Hemisphere is not extensive, and almost confined to the shores of England and of the German Ocean. It is, however, found at Unalaschka, according to Postel and Eupprecht.
3. Desmarestia Ugulata, Lamourx. Grev. Alg. Brit. p. 37. t. 5. Turner Hist. Fuc. t. 99.
Hab. Hermite Island, Cape Horn ; rare.
Our specimens in no way differ from European ones. It is probably a common Antarctic species, for we have received it from the east coast of Patagonia.
4. Desmarestia herbacea, Lamourx. Montague in Toy. au Pole Sud, Bot. Crypt, p. 50.
Hab. Port Famine, Strait of Magalhaens ; M. Homlron.
We have seen no Antarctic specimens of this plant, which is also a native of the Cape of Good Hope, Concepcion on the west coast of South America, and of North-west America.
5. Desmarestia cJwrdalk, Hook. fil. et Harv.; fronde coriaceo-cartilaginea compressa anguste lineari tri-quadripinnata, pinnis pinnulisque longissimis oppositis distantibus apice longe nudis, pinnulis ssepe alternis elongatis inermibus chordiformibus. Nobis in Loud. Journ. Bot. vol. iv. p. 249.
Hab. Cbristmas Harbour, Kerguelen's Land ; very abundant, in two to five fathom water.
Alga socialis, rupicola, ca^spitem graminearn submarinam late extensam efficiens. Frondes e radice anguste scutata valde elongata?, 3-5-pedales. Stipes 1-1£ lin. diametro. Pinna paulo angustiores, pinnulis lin. latis.
A very noble species, recognizable at once by the long whip-like naked apices of its pinnae. In the great abundance of this Alga consists one of the peculiarities in the submarine vegetation of Kerguelen's Land.
6. Desmarestia Rossii, Hook. fil. et Harv.; fronde coriaceo-cartilaginea compressa lineari bi-tripinnata circumscriptione anguste lanceolata, pinnis pinnulisque ornnibus oppositis basi apiceque attenuatis acutis erectis v. ultimis appressis margine integerrimis. Nobis in Bond. Journ. Bot. vol. iv. p. 249. (Tab. CLXX1L, CLXXLTI.)
Hab. Staten Land, A. Menzies, Esq. Hermite Island, Cape Horn, and the Falkland Islands ; very abundant.
Frondes 4-8 ped. longae, anguste lanceolatae, nunc apices versus dilatatae, inferne bipinnatse, supra medium tri-pinnatae, valde coriaceae. Caules stricti, 2-3 lin. lati. Pinna 1 lin. lata? pinnimlaeque oppositae, suberectse, axillis acutis, basi apiceque attenuatse.
Even a nobler species than the last, from its great size and opposite ramification. In general form it resembles the D. Ugulata, but is of a totally different consistence, being much more rigid, coarser, and thicker. The fronds are sometimes curiously dilated towards the apex, when they are generally linear below the expanded portion. This appearance is produced by the upper pinnae elongating and becoming thrice pinnated ; they are then also of a paler colour than the lower ones.
Plate CLXXII., CLXXIII. Fig. I, transverse section of stem ; fig. 2, horizontal, and fig. 3, vertical slice of the same : — magnified.
8. DICTYOSIPHON, Grev.
1. Dictyosiphon fasciculatus, Hook. fil. et Harv., in Fl. Antarct. Pt. 1. p. 178. t. 49. f. 1.
Hab. Berkeley Sound, Falkland Islands, and Christmas Harbour, Kerguelen's Land.
We have before noticed this plant, which is the Southern representative of the Northern and Arctic D. fanieu-laceus.
