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1 7 8 F LO EA ANTAECTICA. [AitcMand and
5. MACROCYSTIS, Ag.
1. Macrocystisyjyrÿèra, AgarcQi, 8p. vol. i. p. 47. Nov. Act. N a t. Cur. vol. xix. p. 297. t. 26. f, 1.
H ab . Lord Auckland’s group, Campbell’s Island, and in tlie open sea to th e south as far as the 6 5tk degree.
The observations on this genns and its distribution, are reserved for the Cryptogamic portion of the other
Antarctic Islands.
6. DESMAEESTIAj Lamonr.
] . D esmarestia viridis, L amonr.; froude cartilaginea basi subcompressa, supra cylindracea decomposito-
piimata, pinnis pinnulisque exacte oppositis filiformibus ultimis capülaribus. D. viridis, Lamonr. in Ann.
Mus. XX. 25. Endl. Gen. P L Suppl. vol. iii. p. 28. Kü tz. P h jc . Gen. p. 344. Diclüoria viridis, Greo. Alg.
B r it. p. 36. t. 6. Sporoclinus viridis, Ag. Spec. Alg. vol. i. p. 154. Sgst. p. 259. Eucus viridis, FL Ban.
t. 886. T n rn .llis t. Flic. 4 .^ 1 . Engl. Bot.
H ab . Lord Auckland’s group. [Lr. Lyall.)
We defer oiir remarks on this plant, and on the genus Desmarestia iu general, to a future portion of this work.
The present species was found abundantly at Christmas Harbour in Kerguelen’s Land, Berkeley Sound, aud Port
William in the Falkland Islands, and at Cape Horn ; and isitJ, therefore, come more properly along with some new
species into the flora of those regions.
7. DICTYOSrPHON, Grev.
Ob s . The follo'wing species differs in some points from this genus, being of a thicker substance aud 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. StiU the fructification is so identical with that of
Dictyosipkon, that we are unwilling to separate it, especiaUy since the habit is not dissimilar.
1. fascicv,latus, Hook. fil. et H a rv .; caule filiformi subiudiviso, ramis abbreviatis
pluries ramosis quadrifariis raro oppositis sæpissime fasciculatis alternis vel secundis omnibus ramulisque
basi attenuatis acutis, sporis densissime per ramulos sparsis semi-immersis. (Tab. LX IX . Fig. I.)
H ab. Lord Auckland’s group ; on rocks in the sea.
Radix pusiUa? Frondes circumsciiptione lanceolatæ, cæspitosæ, 4-8 unc. longæ, fusco-olivaceæ, membranaceæ,
vix coriaceæ, cylindraceæ, v. subcompressæ, primo filis articulatis laxe repletæ, mox tubulosæ et cavæ, e celhüis minutis
coloratis rotundis 3 ^ serialibus interioribus majoribus formatæ. Caidis indivisus vel basi in ramos elongatos
simplices partitus, inferne setaceus, supra sensim latior, medio ^ - 1 Ru. latus, apicem versus attenuatus,
per totam longitudinem ramis plm-imis patentibus vestitus. Rami breves, 1 -2 unc. longi, nunc brevissimi, utrinque
attenuati, irregulariter inserti, nunc quadrifarii, nunc subdistichi, sæpissime fasciculati, alterni vel secundi, rarius
oppositi ; ramrdis conformibus setaceis, gracilibus, erectis, alternis, oppositis v. fasciculatis, simplicibus, basi attenuatis
apice subulatis. AxUloe acutæ. Sporæ olivaceæ v. nigræ, ovales, per totam frondem sparsæ, nec in soros aggre-
gatæ, limbo tenui hyalino cinctæ, semi-imraersæ, demum prominulæ.
A single specimen of this plant, which seems to be common in Lord Auckland’s group, was picked up by
Dr. LyaU in Berkeley Sound, Falkland Islands. It was more bushy than the Auckland Island specimen, with longer
l)ranches ; the outhne is ovate and not lanceolate ; the main branches chiefly are crowded and fasciculate, the minor
ones of the ramuR more frequently distichous, often opposite and ratlier patent. In fact, part of the plant exhibits the
bushy aspect of BictyosipJion and part resembles Striaria ; the scattered fruit distinguishing it from the latter genus.
Pl.vte LXIX. Fig. I.—1, a specimen of the natural size; 2, branch ; 3, section of ditto;—magnijied.
F
CamphelVs Islands.] F LO EA ANTAECTICA. 1 7 9
8. CHORDA,
Frons tubulosa, filiformis, simplex, intus transversim septata, extus filis minutis clavatis horizontalibus omnmo
velata. Fructus ; aporcB i>yriformes fills periphericis immersæ.
1. Choiida lomentaria, Lyngb., HyAr. Ban. p. 74. t. 18. Grev. Alg. B r it. p. 48. Hook. B r . PI.
vol. ii. p. 276. Harv. B r . A l g .-ÿ.No. Wyatt, Alg. Banvi. no. 6. Scytosipbon M um , var. y. Ay. Sy). A7y.
vol. i. p. 162. Ay. Syst. p. 257. C. rimosa, M o n t.l Prod. Pkyc. Antarct. p. 12. Voy. au Pole Sud, Boi.
Crypt, p. 44.
H ab. Lord Auckland’s group ; on rocks in th e sea.
Radix scutata. Frons (in exemplaribus Aucklandicis) pedabs, 2 bn. lata, basi tenuissima, longe setaceo-fili-
formis, sursum sensim latior, apicem versus subattenuata vel acuminata, remote septata, constricta, iuterdimi sub-
contiuua et æquabs. Cohr sordide badius v. fusco-obvaceus. Superficies tola fibs clavatis minutissimis sporis
immixtis velata.— Chartæ arcte adhæret.
These specimens difier sbghtly from the Em-opean form of the species, in having the constrictions less obvious
aud at much wider intei-vals. Iu some individuals scarcely any constriction occurs, and then it is not easy at first
sight to distinguish them from a common state of Asperococcus ecliinatus. In others, again, they ai-e evident, and
microscopical examination proves that they do not belong to Asperococcus. At the Falkland Islands this plant was
also found, and the specimens from that locality are identical with the common European appearance.
9. N m S iO C Y S n S , Hook. f i l. et Harv.
Radix scutata. Frons membranacea, saccata, intns cava, aqua repleta, foveis convexis opacis fila arachnoidea
emittentibus conspersa, fibs minutis clavatis omnino velata. Fnictus-. syiora pyififormes fibs pieripheriois immersæ.
Obs. This genus differs from Asperococaas in having its fructification spread over the entire surface, as in
Chorda, and not confined to distinct sori ; and from the latter in being destitute of septa, and in possessing innumerable
pale depressions, composed of racUating filaments with very short coloured joints, emitting from their apices
tufts of colourless, long, jointed, byssoid fibres. These appear afterwards to faU away, leaving depressions and often
punctures of the membrane in their place. The tufts of arachnoid fibres do not expand web after baring been
dried, though they may always be found in the damaged state, by carefully scraping away the surface of the frond.
: i |
i ■-
1. Adenocystis Lessoni, Hook. fil. et H a rv ,; Asperococcus Lessoni, Bory, in Buperrey T'oy. p. 199.
t, 11. f. 2. iy ii. p. xlii. P tid l.G e ? i.S iip p .m i.m .i] .2 6 . (Tab. LX IX . K g . II .)
ILvb. Lord Auckland’s group ; on rocks left by th e tide, abundant.
Radix scutata, exigna. Frondes lA \mc. longæ, ) latæ, cæspitosæ, e stipite setaceo-fibformi 1 lin. longo ortæ,
eUipticæ vel obovatæ, inflatæ, aqua semper repletæ, obtusissimæ, membranaceæ, vix reticulatæ, ceUubs minutissimis
constitutæ, glandulis superficiariis v. subimmersis convexis dense conspersæ. Glandulæ hemispbæricæ, e filis minutis
radiantibus brerissime ai'ticulatis atro-fuscis formatæ, fibribas penicülatas longe articulatas hyalinas aracbnoideas
apice gerentes, demum concavæ. Superficies frondis fibs coloratis (endochromaticis) minutissime clavatis erectis in
strato tenuissimo connexis induta. Sporæ obovatæ, nigro-fnscoe, limbo byabno cinctæ, per totam frondem sparsæ,
filis poripliericis immersæ, sessiles. Color fusco-olivacens, sordidus. Substantia mollis.—Chartæ adhæret.
Our plant strongly resembles the Fucus saccatns of Turner, ÇDumoutia saooata), especially specimens from
Nootka Sound ; a close microscopic examination being necessary to distinguish them. Possibly tbe plant, abuded
to by Turner, in bis description of F. saccatns, as having been sent to him from New Holland by Mr. Brown, and