66 CRYPTOGAMIA ANTARCTICA. | Auckland and 
5. MACROCYSTIS, ۰ 
1, Macrocystis pyrifera, Agardh, Sp. vol. i. p. 47. Nov. Act. Nat. Cur. vol. xix. p. 297. t. 26. f. 1. 
Has. Lord Auckland’s group, Campbell’s Island, and in the open sea to the south as far as the 65th degree. 
The observations on this genus and its distribution, are reserved for the Cryptogamic portion of the other 
Antarctic Islands. 
6. DESMARESTIA, Zamour. 
1. DESMARESTIA viridis, Lamour.; fronde cartilaginea basi subcompressa, supra cylindracea decomposito- 
pinnata, pinnis pinnulisque exacte oppositis filiformibus ultimis capillaribus. D. viridis, Lamour. in Ann. 
Mus. xx. 25. Endl. Gen. Pl. Suppl. vol. iii. p. 28. Kite. Phyc. Gen. p. 344. Dichloria viridis, Grev. ۰ 
Brit. p. 36. t. 6. Sporochnus viridis, Ag. Spec. Alg. vol. i. p. 154. Syst. p. 259. Fucus viridis, 77. Dan. 
t. 886, Turn. Hist. Fuc. t. 97. Engl. Bot. t. 1669. 
Has. Lord Auckland's group. (Dr. Lyall.) 
We defer our remarks on this plant, and on the genus Desmarestia in general, to a future portion of this work. 
'The present species was found abundantly at Christmas Harbourin Kerguelen's Land, Berkeley Sound, and Port 
William in the Falkland Islands, and at Cape Horn; and will, therefore, come more properly along with some new 
species into the flora of those regions. 
7. DICTYOSIPHON, Grev. 
Oss. The following species differs in some points from this genus, being of a thicker substance and denser 
structure, and with the walls composed of a greater number of rows of cells, which are themselves very much smaller. 
The surface of the frond is, therefore, not in the least reticulated. Still the fructification is so identical with that of 
Dictyosiphon, that we are unwilling to separate it, especially since the habit is not dissimilar. 
1. DrorvosreHoN? fasciculatus, Hook. fil. et Harv.; caule filiformi subindiviso, ramis abbreviatis 
pluries ramosis quadrifariis raro oppositis seepissime fasciculatis alternis vel secundis omnibus ramulisque 
basi attenuatis acutis, sporis densissime per ramulos sparsis semi-immersis. (Tas. LXIX. Fig. I.) 
Has. Lord Auckland's group; on rocks in the sea. 
Radix pusilla? Frondes circumscriptione lanceolate, ceespitosee, 4—8 unc. longæ, fusco-olivaceze, membranacee, 
vix coriaces, cylindracez, v. subcompressz, primo filis articulatis laxe repletee, mox tubulose et cavee, e cellulis mi- 
nutis coloratis rotundis 3-4 serialibus interioribus majoribus formatee. Caulis indivisus vel basi in ramos elon- 
gatos simplices partitus, inferne setaceus, supra sensim latior, medio 4-1 lin. latus, apicem versus attenuatus, 
per totam longitudinem ramis plurimis patentibus vestitus. Rami breves, 1-2 unc. longi, nunc brevissimi, utrinque 
attenuati, irregulariter inserti, nunc quadrifari nunc subdistichi, seepissime fasciculati, alterni vel secundi, rarius 
oppositi ; ramulis conformibus setaceis, gracilibus, erectis, alternis, oppositis v. fasciculatis, simplicibus, basi attenuatis 
apice subulatis. ville acute. Spore olivaceæ v. nigree, ovales, per totam frondem sparse, nec in soros aggre- 
gate, limbo tenui hyalino cinctee, semi-immerse, demum prominule. 
A single specimen of this plant, which seems to be common in Lord Auckland's group, was picked up by 
Dr. Lyall in Berkeley Sound, Falkland Islands. It was more bushy than the Auckland Island specimen, with longer 
branches; the outline is ovate and not lanceolate; the main branches chiefly are crowded and fasciculate, the minor 
ones of the ramuli more frequently distichous, often opposite and rather patent. In fact, part of the plant exhibits the 
bushy aspect of Dictyosiphon and part resembles Striaria; the scattered fruit distinguishing it from the latter genus. 
PrarE LXIX. Fig. 1.—1, a specimen of the natural size; 2, branch; 3, section of ditto ;—magnified. 
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