OF THE ANTARCTIC VOYAGE. 293 
two beautiful Senecios, and large patches of a Tortula, like 
ruralis. It was among these hills that Freycinet encamped 
his crew, and a sketch, which I have copied from one that was 
done at the time by an English sailor of the party, and which 
belongs to the Governor here, represents the scene. In 
Weddell’s Voyage you will find some particulars of this 
disaster. The sand is of the purest snowy white, against 
which the sea appears of a brilliant blue. Large beds of 
Kelp cover the rocks outside, and have now hidden the wreck 
of the * Uranie,’ of which no sign appears, but some copper 
and a few iron watercasks on the beach. 
* At the back of the sand-hills are several pools of water, in 
which I gathered Gaudichaud’s Limosella and Myriophyllum ; 
but though I have been hunting ever since I came here for 
the Azolla, in similar situations, not a trace of it has met my 
eyes. On the beach lie huge trunks of Sea-weeds, perhaps 
the D’Urvillea, branched like a tree; sometimes a foot in 
diameter, and often 12-14 feet long. A horizontal section of 
the stem presents oval concentric rings, answering to succes- 
sive periods of its growth. These rings are composed of cells, 
containing a viscid fluid, which evaporates as the trunks dry 
up, till these, shrinking excessively, become harder than horn. 
It is singular that the Usnea, perhaps the largest form among 
Lichens, presents a still more striking analogy to exogenous 
vegetation ; so remarkable that I think it must be noticed 
somewhere. A horizonal section of any of its stems or — 
larger branches, exhibits a distinct cortical layer, ofa yellow — 
colour, and coriaceous consistency, loosely attached to an 
inner corky layer, which sends medullary rays through a hard 
red horny axis, to meet a central corky pith. Except that 
these layers are all separate forms o; cellular tissue, they are, 
in every respect, analogous to the Bark, Wood, and Pith of a 
tree. I think that the red horny tissue expands over the 
` excipulus of the thallus, and gives off the peridia.” 
‘> The most interesting and useful vegetable production of 
the Falklands is undoubtedly the Tussack Grass ; a name evi- 
