+ Kip 
150 CRYPTOGAMIA ANTARCTICA. ] Fuegia, the 
2. DURvILLEA Harveyi, Hook. fil.; radice e fibris crassis demum anastomosantibus constante, stipite 
perbrevi valido compresso in laminam subsolidam coriaceam apice laciniatam gradatim dilatato. Nobis in 
Lond. Journ. Bot. vol.iv. p. 249. Himanthalia D’Urvillei, Bory ? in Duperrey Voy. Bot. p. 135. (TAs. 
CLXV, CLXVI.) 
Has. Hermite Island, Cape Horn, and the Falkland Islands; abundant. 
Radix fibrosus, fibris crassis, inter se intricatis, demum anastomosantibus, discum callumve pertusum 2—4 unc. 
diametro efficientibus. Stipes 3—4-uncialis, 4-2 unc. diametro, valde compressus, in laminam forma variam 
gradatim dilatatus. Lamina 4-8-pedalis, supra medium 1-2 ped. lata, plerumque late lanceolata, basi angustata, 
apicem versus in lacinias plures lineari-elongatas ligulatas abbreviatasve acutas truncatasve fissa, siccitate atro-fusca 
v. subpicea, opaca, dura, subfragilis, lineis superficialibus striata, v. subreticulata, e conceptaeulis prominulis mamillosa ; 
madore olivaceo-brunnea, coriacea v. flaccida, plana, levis, intus solida, 1-4 lin. crassa. Conceptacula sphzerica, 
per totam frondem sparsa, poro inconspicuo pertusa, filis articulatis sporisque basifixis repleta. Spore ut in D.utili, 
varie quaternatim divise, limbo hyalino cinctæ. : 
Always considerably smaller than the D. utilis, of a much thinner texture, and readily distinguishable by its 
fibrous root. I have never observed the frond of even the largest state of this species to be filled with those 
elongated transverse cells which distinguish the former. 
The structure of the fronds is seen to consist, on a transverse section, of a dense narrow layer of cortical sub- 
stance, which gradually becomes more open inwards, and there breaks up into parallel lamellee projecting towards the. 
centre of the frond. These are less densely packed inwards, and are united at right angles by similar very 
short plates, together forming a loose cellular tissue, whose walls are thickened at the angles ; Which, again, at the 
very centre of the frond, are gradually resolved into a mass of slender, short, waved filaments, free or anastomosing 
aud floating in a gelatine. 
The affinity of the Laminaria potatorum is probably with this genus; it is described, by M. Kützing, under the 
generic name of Sarcophycus (Phycologia, p. 392). I have examined a very small fragment of the plant, and find 
the spores to be contained in cysts, altogether like those of D’ Urvillea and Xiphophora. 
Prares CLXV, CLXVI.—1, transverse slice of frond; 2, vertical section of ditto; 3, spores and antheridia ; 
4, spores :—highly magnified. 
2. SCYTOTHALIA, Grev. 
1. ScyrorHauıa Jacquinotii, Mont., in Voy. au Pole Sud, Bot. Crypt. p. 86. t. 5. 
Has. Graham’s Land; lat. 63° S., floating in the ocean, Dr. Lyall. Deception Island, New South 
Shetlands; Mr. Webster. 
An accurate description of this noble sea-weed is given by its discoverer, Mr. Webster, R.N., in the Appendix to 
the Nairative of Capt. Foster's Voyage ; though nothing was known of the species, botanically, until specimens were 
received by Dr. Montagne, from the Herbarium ofthe French South Polar Expedition, collected within a very few miles 
of the spot where it was again seen by the Antarctic Expedition, and obtained by our indefatigable friend, Dr. Lyall. 
The existence of this sea-weed on the Icy shores of an Antarctic land, in the longitude of Cape Horn, is a most 
singular and anomalous fact ; for I believe it to be the only species of the tribe Cystoseiree, which inhabits the colder 
or Antarctic seas of South America; though many abound in similar temperate latitudes of New Zealand, Lord 
Auckland's group, New Holland, and Tasmania. We have thus, under the most rigorous skies, the representative of 
a group, the total absence of whose other species in warmer seas of the same longitude, was supposed to be owing 
to a low degree of temperature being destructive to its life. The said group of Cystoseirez is not here represented by a 
species in any way indicative of its habitat being far removed from its congeners, or of its locality being uncongenial, 
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