Y .
!l
I t o '
t *d
J
t r i
ñ í£
^■=
l-..\ff]
I ’
, ;K
th e description of that author in every particular ; except that the compression attributed to the frond is certainly
not a character of our specimen, aud most probably originated in that of Gaudichaud from had diying.
P late CLXXXIV.—Two states of R. Gaimardi, of the natural size. Fig. 1, rnmub and stichidia ; Jig. 2, tetraspores
; f g . 3, section of stem -.— magnifed.
3 . E hodomela? emmsa, Hook. fil. et H a rv .; ramosissima, atro-rubescens, eaule cylindraceo frondem
percurrente ramis erebris alternis ornato, ramis cylindraceis elongatis pluries alterne divisis erecto-patentibus
sensim utrinque attenuatis, ramulis ultimis setaceis acutis abbreviatis vagis, capsulis ovatis breve pediceUatis.
Nobis in I m i . Jm r n . Bot. vol. iv. p. 2 6 3 . Harv. Ner. Ausf. t. xi. (Tab. CLXXXV.)
Var. fi. filrU U fe ra -, fronde tenuiori laxius ramosa, apicibus fibrilliferis.
H.ab. Berkeley Sound, Falkland Islan d s; both varieties abundant.
Caulis cylindraceus. 6-9 uno. longus, 1 - l i Im. diametro (in var. ft gracilis) indivisus v. e basi in ramos primarios
Srt-divisus. Rami primaidi secundariis perplminis aucti, secimdard ramulis brevibus setaceis ornati, ultimis
in var. ft. fibrilliferis ; omnes e tubulis septem circa axin centralem articulatam dispositis et strato externo cellulorum
densorum circumdatis conflati. Ceramidia numerosa, secus ramulos últimos tertiariosque disposita, parva, ovata,
breviter pedicellata. SM a n tia flaccida, opaca, primo visu inarticulata, sed vere articulata. Color luridé rufo-’
brunneus :—chartæ arcte adhæret.
A very much branched species, variable iu size and in the density of the ramification. In old specimens the
stem becomes considerably incrassated and constricted at irregular intervals. Being unacquainted with the
secondary fructification, we doubtfully refer this plant to Rlwdomela ; it may belong to Basya.
P l.ate CLXXXV .—Two vars. o tR .? comosa, of the natural size. Fig. I a, branch and ramuli of var. a , jig. 2 a
section of ditto ; f g . 3 a, tissue ot ditto ; f g . 1 S, portion of branch and ramulus of var. ft. with ceramidia ; fig. 2 b,
fibrilliferous apex of ditto :—h'~''’---------
25. ÌIE L O B E S IA , Lamx.
1. M elobesia mrrvxata, Lamx. Polyp, flexibles, p. 315. Beeaisne in Ann. Sc. Na t. Ser ii vol xviii
p. 126.
Var. Antaretica ; fronde circumscriptione orbiculari lobata medio adnata margme integerrima libera,
superficie lævi lineis concentricis undulata, ceramidiis depresso-liemisphæricis :— an species distincta ?.
H ab . Var. ft. Hermite Island, Cape H o rn ; tbe Falkland Islands, and Kerguelen’s L a n d ; encrusting
shells, and the stems of Algoe, particularly of B a liia B ru nm is.
The M. vemcafa is a native of the Atlantic Ocean and Mediterranean Sea ; the var. ft, of the Antarctic Ocean ;
of Lord Auckland’s Group, New Zealand and Tasmania. The ceramidia are intermediate in size hetween those
of M. verrucata and M.pustulata, Lamx. We have little doubt of this being a new species ; but the materials for its
determination are wanting.
26. DASYA, Ag.
1. Hook. fil. et H a rv .; setacea, rigida, purpurea, fronde basi nuda superne distiche
decomposito-pinnata, ramis articulatis tri-striatis pectinato-pinnatis, ramulis (v. pinnulis) simplicibus alternis
brevibus subulatis articulatis monosiphoniis, articulis diametro sesquilongioribus, ceramidiis urceolatis
pedicellatis. Polysiphonia pectinata, nohis in Lond, Journ. Bot. v. iv. p. 267.
Falklands, etc.] F L O llA A NTAllC T ICA . 483
H ab . Hermite Island,Cape H o rn ; dredged up from about six fatbom water, and on rocks a t low-
water mark, very rare ; Falkland Islands, Mrs. Capi. Sulivan.
Species pulcherrima, habitu Bonnmaisonice asparagoidis. Frons 2-4 unc. longa, circumscriptione late ovata >
2 unc. lata, rigida, distiche ramosa, v. ramosissima, ramis setaceis decomposito-pinuatis. Caulis primarius simplicius-
culus, basi inarticulatus, superae articulatus, tri-striatus, compressus v. angulatus. Rami minores ramulis alternis
ornati, omnes breves, subulati, e singulo serie cellularum formati, hinc monosiphonii. Articuli omnes breves,
caubni e tubis quatuor inæqualibus (quorum 2 laterabbus latioribus,) cbca cavitatem centralem dispositis conflati ;
articuli ramulorum Callitiiammo forma et structm-a similbmi. Ceramidia secus ramulos disposita. Color pulchre
pui-pm-eo-rosens.
A veiy beautiful aud rare species : distmct from any of its European and exotic congeners that have been
described. Mi-s. Subvan’s specimens are much finer and more branched than those from Cape Horn.
27. ST ICTO S IPH O NIA , Harv.
Frons purpurea, filiformis, cybndracea, ramosa, tubulosa, extus stictis quadi*atis notata, intus diaphragmatibus
septata. Feriphei-ia e cellubs quadratis tubum centralem cavum radiatbn cingentibus formata. Ceramidia p
-■S/ic/iii/i® lanceolata, ramulos terminantia, tetrasporas pluriseriatas foventia.— pusilla, caspitosa, ejilis repentibus
orta, rupes marinas Antillanas, Austro-Atlánticas, Antarcticasque vix demersas v. ad limitem pieni maris oestus sitas
incolentes.— Genus Bostigchia, Mont. valde afíbie.
A very natural bttle group : composed of a few species, which occupy the same position with regard to the
high-water mark in the Southern Ocean, that LicMna and Catenella do in the Northern. As a genus it differs from
Bostrychia, Mont., only in the more simple internal structure of the frond, and broad, apparently septate, tubes,
surrounded by only one row of cells occupying the centre of the frond : in habit and other respects they are so
closely albed, that it is doubtftil whether Stictosiphonia should not rather be regarded as a subgenus of Bostrychia.
The striictm-e of the frond is very sbnilar to that of Polysiphonia, diffeibig chiefly in the cebules of tbe periphery
being very short ; wlblst those constituting the axis are lengthened.
1 . Stíctosiphonia Hookeri, H a rv .; caulibus iudivisis curvatis apice involutis, ramis lateralibus abbreviatis
alternis subquadrifai'iis erecto-patentibus, inferioribus subulatis simpbcibus furcatisve, superioribus
alterne multiñdis, ramulis subulatis acutis erectis, axilbs acutis, stictis subtriseriatis, sticbidbs lanceolatis
acutis ramulos minores termiuantibus. Bostryclua Hookeri, Harvey in Lond. Journ. Bo i. vol. iv. p. 269.
(Tab. CLXXXVI. Eig. II .)
H ab. Hernute Island, Cape Horn ; and tbe Ealkland Islands : on rocks close to bigb-water mark ;
abundant.
Frons 1 -1^ unc. longa, dense cæspitosa, rigida, atro-pui-pui’ea. Caulis pleramque simplex, per totam longitu-
dincm ramubs brevibus lateralibus ornatus. Rami nunc omnes 1 lin. longi et indivisi v. superiores elongati 2 -4 bn.
longi, repetitim ramosi. Ramuli ultimi subulati, erecti erecto-patentesve. Rami ramulique omnes apicibus plerumque
arcte involutis :—cbartæ laxe adhæret.
A beautiful bttle plant, maiked all over, under the irbcroscope, with tliree rows of dark purple dot-like cells.
P late CLXXXVI. Fig. II.—1, plant of the natural size ; 2, stem, &c. ; 3, ramulus and stichidium ; 4, portion
of stem ; 5, longitudinal and 6, horizontal section of ditto ; 7, tetraspores ;—all ?
2. Stictosiphonia fa s tig ia ta . Hook. fil. et Harv. ; caulibus fastigiatis multifidis apicibus involutis.