I Iab. Georgetown; plentiful.
D i s t r ib . South coast o f New Holland.
Gen. XLIV. ACANTHOPHORA, Lx.
(Lamoui-. Ess. p. 44. Grev. Syn. p. 54. Endl. 3rd Suppl. p. 47. Haiv. Ner. Austr. p. 34. Kiitz.
Sp. Alg. p. 858.)
1. Acanthophora Tasman ica (Sond.); fronde cartilaginea ultrasetacea decomposite ramosissima,
ramis primariis elongatis lateraliter ramosis, secundariis brevibus ramulis brevibus plus minus onustis,
spinulis minutis quaquaversis pinnatifido-dcntatis solitariis v. aggregatis nunc spinula subulata indivisa
fulcratis.— Sond. in Linn. xxv. p . 699. Polysiplionia, «. sp. ?, Earv. Alg. Austr. Exsicc. No. 165.
H a b . Georgetowu, between tide-raarks, on the flats, B. Gnnn, W. II. H., etc.
Frond twice as thick as hog’s-bristle, 6 -8 inches long, much branched, the branches three to four times compounded
in an alternate manner, spreading to all sides. Main branches 3-4 inches long, nearly bare below, in
the upper part set with one or two series of short, simple, or little-divided branchlets. AU the younger branches
and ramuli are closely beset with patent spinulæ, half a line in length, spirally inserted, very patent and sharply
inciso-dentate or pinnatifid. Colour a dark brown. Substance cartilaginous, rather soft, adhering to paper.
2. Acanthophora arborea (Harv.) ; fronde dendroidea incrassata decomposite ramosissima, ramis
primariis elongatis versus apicem attenuatis lateraliter ramosissimis, ramis secundariis brevibus dichotomo-
multifidis, ramulis brevissimis spinulosis, spinulis subulatis fasciculatis undique insertis imbricatis, cera-
midiis subterminalibus pedunculatis ovatis.— A. Tasmanica, Ilarv. Alg. Austr. Exsicc. n. 140 [not o f
Sonder).
H a b . Rocks : at low water-mark, in the Tamar, above Georgetown, W. II. II.
Fi-onds 12-18 inches long, as thick as crowquill below, attenuated upwards, branched from a short w<ay above
the base, bushy and tree-like. Principal branches few, subsimple, resembling the main stem, and equal in thickness,
erecto-patent, more or less clothed with lesser branches. The secondaiy branches are 1-2 inches long, slender as
hog’s-bristle, and much divided in an irregularly dichotomo-alternate manner, the ultimate ramuli being not more
than two or three liues long. All the lesser divisions and ramuli are closely set with imbricated subulate spines
directed to ah sides. Capsules ovate, on longish stalks, near or at the end of the branches. Colour dark brownish-
purple when fresh, black when dry.
Gen. XLV. RHODOMELA, Ag.
(Ag. Sp. Alg. i. p. 368. Grev. Syn. p. 51. Endl. 3rd Snppl. p. 47- Harv. Ner. Austr. p. 34.)
1. Rhodomela peric lad os (Sond.); cæspitosa, fronde subsimplici v. furcata, ramis paucis lateralibus
simphcibus, ramulis aculeiformibus acutis brevibus demum fasciculato-multifidis undique insertis,
cystocarpiis subglobosis sessilibus v. brevissime pedicellatis, tetrasporis in ramulis fasciculatis ultimis
nidulantibus.—Earv. E/igc. Austr. t. 28. R. simpliciuscula, Earv. Alg. Austr. Exsicc. n. 136.
H a b . East coast, and Brown’s River, Ii. Gunn. Southport, C. Stuart.
D is tu ib . Port Phillip, Victoria, Mueller, JF. II. II.
Densely tufted. Fronds issuing from matted roots, 2-4 inches high, simple or once or twice forked, and occasionally
fui-nished with one or two lateral simple branches. Branches sometimes nearly naked, but in well-grown
specimens furnished through the whole length with spinelike ramuli, 1 -2 lines long, which are at fost subsimple,
but afterwards, by development from their inner side, become fasciculato-multifid. Colour very dark brown, black
when dry. Substance rather rigid, not strongly adhering to paper in drying. Cyslocarps (on the Port Phillip specimens)
roundish-ovate, with wide mouths, sessile on the ramuli, or near the tips of their lesser divisions. Telraspores
(on Tasmanian specimens) in an iiTcgular double row in the ultimate ramuli.
Gen. XLVI. CHONDRIA, Ag.
(J. Ag. ref. Harv. in Ner. Bor. Amer. pt. 2. p. 19. Fl. N. Zeal. p. 223.)
1. Chondria dasyphylla (Ag. Sp. Alg. i. p. 350).—Laurencia dasypliylla, Grev.; Earv. Phyc.
Brit. t. 152. Fucus dasyphyllus. Turn. Hist. t. 22, etc.
H a b . Common at Georgetown. Derwent, Oldfield.
Tlie Tasmanian specimens ai’e frequently of vciy laige size, 3-4 feet long, and excessively branched. Such
specimeus gi'ow in the deeper and more rapid paiis of the Tamar channel.
2. Chondria v er ticilla ta (Harv.); fronde tereti succosa siccitate badia bis-terve umbellatim divisa,
ramulis fasciculato-verticillatis saccatis oblongis obtusissimis basi-constrictis, tetrasporis iu ramulis nidu-
lantibus.—Earv. in Trans. B. I. Acad. xxii. p. 5 3 9 ; Alg. Austr. Exsic. n. 161.
H a b . Georgetown, rare, R. Gunn, Rev. J. Fereday.
3. Chondria tenu issim a (Ag.).—Laurencia tenuissima, Grev.; Earv. Phyc. Brit. f. 198. Fucus
tenuissimus, Turn. E is t. t. 100 (?)
H a b . Georgetown, R. Gunn.
4. Chondria opuntioides (Harv.) ; fronde inferne cartilaginea solidescente obsolete constricta
dichotoma, superne di-trichotoma articulato-constricta membranacea succo aquoso repleta, ramulis ad
genicula verticillatis articulatis, articulis ramorum puncto affixis (cito in aqua dnlci sejunctis) ovali-
oblongis basi et apice obtusissimis, cystocarpiis ovatis sessilibus.— Chylocladia opuntioides, Earv. Trans.
B. I. Acad. xxii. p . 556. C. Tasmanica, Lond. Journ. iii. p . 444. Cateuella major, Sond. PI. Preiss.
{fidesp.!) Rhabdonia Soiideri,/ . («(?// /fa re .). (Tab. CLXXXIX.)
H a b . Georgetown, e tc .; common.
D i s t r ib . West and south coasts of Australia.
Fronds a foot to 18 inches high, and as much iu expansion, tufted, excessively branched in a di-tiichotomous
manner. Main stem solid, cyhndrieal and continuous in its lower part, becoming more or less constricted upwards
at intervals of about an iuch, then becoming regularly articulato-constricted, hollow, succulent, aud filled with
watery juice, dichotomous or fasciculately branched ; lesser divisions frequently trichotomous, strongly constricted,
beset at the constrictions with more or less abiuidant, whoried, articulated, simple or dichotomous ramuli. Articulations
elliptical or oblong, readily separating. When thrown into fresh-water, the whole frond rapidly breaks up
the branches ami ramuli falling off in single joints, leaving a bare stem, with a few of its principal divisions.
Oystocarps ovate, sessile on the sides of the ramuli. Telraspores of large size, imbedded in the idtimate ramuli.
Colour a full red, rapidly given out in fresh-water. Substance, when quite fresh, cartilaginous, but very juicy, and
soon becoming ftaccicl. In drying, it most closely adheres to paper.
I suppose this to be the Chylocladia articúlala of Australian botanists, as it appeal's to be found commonly
along the whole southern coast, and often assumes the habit of the true C. articúlala of Europe, though differing
greatly from that plant in substance, stnietiu-e, and fructification. At first I refen-ed the present species to Chylocladia,
but the discovery of cystocarps and telraspores on Tasmanian sjiecimens compels its removal into Chondria, where
it associates naturally with C. clavata and C. verticillata.—P late CLXXXIX. Fig. 1, a frond, the natural size ¡
2, ramulus, with tctraspores; 3, a tctraspore ; 4, rainulus, with couceptacle ; 5, spores from the same : the latter
figures magnified.
5. Chondria ? ? bulbosa (Harv.); fronde coccinea a basi ramosa, ramis primariis basi iiicrassato-
TOL. II. 4, Q