I E / ; I
i i
; S 'lM
1S 8
Caulis 4-6 imc. longus, siibdicliotome divisus, 1-S lin. latus, compressus, strictus, ramis subquadrifariis distichisve
dense obsitus. Hami divarienti, stricti, compressi, rugulosi, nuffi, parce pinnati v. subbipinnati, apicibus longe nudis.
Finnulæ horizontales, breves, simplices v. frircatæ, liueares, acutæ, mmc abbreviatm et spiniformes. Color lividus v.
mgro-mbescens, ad apices ramulorum paUidior pui-piu-ascens. Substantia cartilaginco-carnosa, fii-ma, elastica, siccitate
valde contracta.— Chariæ non adhæret.
Our specimens are imperfect and barren, but sufficient to prove them to be a very distinct species of Gigartira.
The whole plant is very elastic, shmiting much in diydng ; internally it is composed of a dense body of anastomosing
filaments, radiating towards the cirenniference through a firm gelatine.
O.pistillata, Lam., is also enumerated in Montague’s account of Lord Auckland’s Island.
25. N OTHO G EN IA, Mont.
1. N othogenia variolosa, Mont. in Ann. Sc. N a t. Series 2. vol, xx. p. 302. t. 10. f. 3. Chondrus vario-
losus, Mont. Prodr. Phyc. Antarct. p. 6. Toy. au Pole Sud, Bo t, Crypt, p. 110.
H ab. Lord Anckland’s group ; on rocks in tbe sea, abundant.
Frondes cæspitosæ, 4-5-unciaIes, anguste liueares, lin. latæ, compressæ, planæ v. snbcanaliculatæ, basi
cuneatæ, superne pluries diohotomæ, laciniis basi angustatis, ultimis elongatis obtusis v. emarginatis i - 1 mic. longis.
Conceptacula per totam lachiiarum siipremarum, immersa, convexa, verrucæformia, poro pertusa, utraque frondis
pagma sparsa. Substantia cartilaginea. Color fusco-ruber, purpurascens.—Chartæ laxe adhæret,
26. CHONDEUS, Stack.
1. Chondeus htierculosus, Hook. fil. et Harv.; fronde cartilaginea basi cuneata late lineari furcata v.
te r quaterve dicliotoma plana v. canaliculata, laciniis patentibus obtusis, axiUis rotundatis, verrucis spliæ-
roideis pagina frondis superiore extantibus medio depressis demum pertusis massam densam sporarum rose-
arum includentibus.
H ab. Lord Auckland’s group ; on rocks in the sea.
Frous 2-uncialis, basi simplex, superne plus minusve furcata, margine simphci pmnuiisve omata. Laciniæ
planæ v. pagina superiore canaliculata, patentes v. divaricatæ, snrsum latiores, obtusæ. Coccidia y. verrucæ numerosissima,
magnitudine seminis Brassicæ, globosa, latere concavo frondis sita, extantia, rarius pagina frondis immersa,
basi constricta, apice depressa v. umbilicata, siccitate apotheciam Lic/tenis referentia, demum pertusa. Sporæ minutæ.
Substantia crassa, carnoso-cartilaginea, siccitate valde contracta. Color lividus.— Chartæ laxe adhæret.
Apparently a distinct species. SmaUer than Noti, variolosa, but broader, less frequently dichotomous and with
very different fi-uctification. The coceidia? are situated ou one side of the frond, prominent, constricted at the base
and contain a large dense spherical mass of sporules, similar to those of the differently shaped warts of Chondrus
crispus. The shape of the fruit is that of Iridæa Radula or stiriata, and when dried under pressure it resembles the
apothecia of a Collema.
27. IR IDÆ A , Bory.
1. I b idæ a Badula, Dory, in Duperrey Voy. Bot. Crypt, p. 107. Crev. Alg. B r it. p. 61. Sphærococcus
Radula, Agardh, Sp. Alg. vol. i. 268. Fucus Radula, Hb. Banks, Bsper, t. 113. Fucus bracteatus, Gmel.,
Turn. t. 25, Mastocarpus Radula, et Chondrodictyon Capense, Kütz. Phyc. Gen. p. 396 and 398.
H ab. Lord Auckland’s group and CampbeU’s Island ; very abundant on rocks in the sea.
Radix scutata, fibris comitata. Caulk 1-2 ime. longus, basi cylindraceus, crassitie pennæ corvinæ, mox com-
pressus, superne dilatatus, divisus v. ramosus. Frondes basi rotundatæ, cuneatæ v. attenuatæ, eUipticæ lanceolatæve,
6-20 une. longæ, rarius bi-tripedales, crassæ, simplices v. fiu-catoe v, ad basin bipartitæ, nunc margine frondes acces-
sorias emittentes, interdum poris perplm-imis pertusoe. Superficies fironik lævis, lucida, adidta papillosa ; papillis
orebenimis, tandem totam frondem utrmque vestientibiis, apice fructiferis, favellidia immersa poro pertusa gerentibus.
Sporæ minutæ, roscæ, densissime aggi'egalæ. Sphærosporæ froniUbiis papiUarmn destitutis immersæ, substrato corticali
sitæ, in globulis minutis punctiformibus aggi-egatæ, totam frondem pustulantcs. Substantia crassa, carnosa.
Color lividus, nibescens pm-piirascensve, rai'o atro-sanguineus.
There is scarcely a maritime rock on the Antarctic coasts, that does not abound with this most protean species
in an stages of growth, and bearing fronds with eveiy variety of outline. I t is much oaten by marine animals, and
from this or other causes, amongst which may be reckoned the fall of the fructiferous papUlæ, the plant is fi-equently
fouiid more or less perforated with round holes, sometimes so regularly as to resemble coarse lace ; this state has
been described by Kützing, under the name of Chondrodktgon Capense, and by Decaisne as Iridæa clalhrata (Ann,
Sc. Nat. Ser. III. vol, ii. p. 236). More puzzling is the form of the secondary fructification or sphærospores, which
is so like a primaiy fruit, that had not both Mi-. Harvey and myself seen this plant gTowing on its native rocks, we
should have supposed the individuals producing them to belong to a different species. The secondary fruit ot
I. stiriata is of the same nature.
The I. micans, Bory, volans, Grev., aud laminarioides, Bory, enumerated by Montagne as natives of Lord
Auckland’s group, are probably states of this,
28. ILALXMENIA, Agardh.
1. UxLY'isiWiiiK latissima, Hook. fil. e tH a rv .; fronde plana tenui gelatinoso-membranacea latissime ovato-
lanceolata simplici bifida v. margine laciniato-pinnatifida, laciniis ovato-lanceolatis acutis. (Tab. LXXIII.)
Var. bifida ; fronde lanceolata basi attenuata bifida v. biforcata, laciniis lanceolatis erectis.
H ab. Lord Auckland’s group and Campbell’s Island ; both varieties abundant on rocks in the sea.
Frondes 2 -1 4 imc. longæ, 4 - 6 latæ, tenues, basi cuneatæ, late lanceolatæ v. ovato-oblongæ, acutæ, simplices
v. fiu’catæ, margine piano simplici integen’imo v. laciniis plurimis subpinnatifido. Substantia gelatinosa. Favellidia
numerosissima, per totam frondem spai'sa, cellulis mcduUaiibus immersa. Color amæne roseus.
"We offer this as a new species uùth some doubt, the varieties of Jl. Ugulata approaching it. The fronds are
so broad and thin, that the favehidia form convexities on its siuface, which are more or less obliterated when moist.
P late LXXIII. Fig. 1, portion of the smface of the frond ; 2, section of the same ; 3, spores all magnified.
29, HUMONTIA, Lamoxir.
1, DuMONTiA/fi/^n«/«, Grev,, Alg. B r it. p. 165. t. 17. Haljunenia, Agardh Spec. Alg. vol, i. p. 214.
H a b. Campbell’s Island. {JDr. Zgall.)
Identical with the Em-opeau plant. Pound also at the Cape of Good Hope and in other widely separated localities.
2. D umontia cornuta, Hook. fil. et Harv. ; fronde tubulosa hic iUic inflata dirisa, parte inferiore nu-
diuscula superiore ramis confertis fixsciculatisve quadrifariis vestita, ramis furcatis patentibus flexuosis alternatim
ramulosis, ramulis recui-ris utrinque attenuatis apicibus acutis.
I I ab. Campbell’s Island. [Br. Lyall.)
Frondes cæspitosæ, 2 -3 une. longæ, tubulosæ, iiTCgulariter inflatæ, 2 hn. latæ, vage divisæ ; ramis intricatis,
patentibus, ilexuosis, furcatis ; ramulis fusiformibus, patentibus v. recmwis. Color fuscatus, badius v. nibescens.
Our specimens of this plant are barren; we refer it to Bimontia from the tubular inflated frond, stimcture, and habit.
2 a