ing species, under the name “ cntciatmif having been misled by external resemblance, The species are abundantly
distinct, the follouing being one of large size, originally described by me as “ Spyridia pellucida.”
4. Callithamnion mucronatum (J. Ag.) ; fronde elata (pedali et ultra) ultra setacea sursum longe
filis stuposis quasi hirsuta et corticata decomposite ramosissima, ramis setaceis pellucide articulatis virgatis
alterne ramosis erecto-patentibus strictis ad genicula pinnatis, pinuis oppositis simplicibus subulatis versus
apicem densissimis acute mucronatis, favellis ramulos terminantibus.—J. Ag. Sp. Alg. ii. p . 29 ; Harv.
Alg. Exsic. n. 546. Spyridia? pellucida, Earv. in Lond. Joum. Bot. iii.^ . 449.
H ab. At and above Georgetown, common.
D ist r ib . Western Port, "Victoria.
Root a mass of matted fibres, often an inch in diameter. Stems many from the same base, a foot or more in
length, twice as thick as hog’s-bristle, aud appearing stiH thicker from the stupose filaments which densely cover
them for more than half their length. These principal stems are sparingly divided, bnt emit throughout their length
a profusion of elosely-placed setaceous branches, 4-6 inches long, and once, twice, or thrice alternately compounded,
tlie ultimate dirisions being from half an iuch to an inch in length. All the axils are acute, and the branches and
rauudi erecto-patent. The branches and ramuli are pellucidly articulate, aud each node bears a pair of minute, subulate,
mucronate pinnules, 1-3 lines long, and generally simple, sometimes very erect and close-pressed, sometimes
more patent. Colour a deep rose-red. Substance somewhat cartilaginous, rather rigid.—By right the specific name
“pellucidum,” piibhshed in 1844, ought to be retained; but I waive priority in favour of the more appropriate one
conferred in 1851 by Professor Agai'dh, who had however a miserably imperfect specimen to describe from. The
species varies much in size, and somewhat in other respects, but is strongly marked by its mucronate, subulate pinnules.
5. Callithamnion T um e r i, var. repens (J. Ag. Sp. Alg. ii. p. 23 ; Harv. Phyc. Brit. t. 179 ;
Harv. Alg. Exsic. n. 521.)—Conferva repens, Dillw.
H ab. On Xiphophora, at Port Arthur, W. H. H.
D ist e ib . Europe.
6 . Callithamnion flaccidum (Hook. fil. et Harv. Lond. Joum. Bot. iv. p. 273 ; Fl. Antarct. ii. t.
188. f. 1 ; Kutz. Sp. Alg. p. 648; J . Ag. Sp. Alg. ii. p. 31).
H ab. Tasmania, Gunn.
D ist r ib . Antarctic Ocean.
The specimens are not in good order.
7. Callithamnion latissimum (Harv. Lond. Journ. Bot. iii. p. 452; J . Ag. Sp. Alg. ii. p. 50).
—Plilebotbamnion latissimum, Kiitz. Sp. Alg. p . 656.
H ab. Abundant in the Tamar.
8 . Callithamnion angustatum (Hook. fil. et Harv. in Lond. Journ. Bot. vi. p. 412 ; J . Ag. Sp.
Alg. ii. p . 64).
H a b . Georgetown, rare, Gunn, W. II. H.
9. Callithamnion violaceum (Harv.); cæspitosa, purpurea,frondibus capillaribus basi in funicuiis
intertextis sursum longe filis radicantibus stuposis pellucide articulatis decomposito-pinnatis, ramis quoquoversum
egredientibus basi pinnatis apice bipinnatis, plumulis simpliciter pinnatis, pinnulis patentibus filiformibus
elongatis, articulis ramorum diámetro séxtuplo ramulorum triplo lougioribus, tetrasporis ad pínnulas
sessihbus subsolitariis globosis.— Earv. Alg. Exsic. n. 517.
Hab. Ou the woodwork of the jetty at Georgetown, W. II. E .
A small species, 2-3 inches high, Jiot unlike the northeni C. roseum, but differing in several respects. The
principal branches are bundled together into ropes, and then closely interwoven by reot-like fibres, which issue from
the nodes, aud proceed downwards along the stem, forming an accessory stupose stratum. The brandies are alternately
pinnate below, and bipinnate above, aD the pinnules remarkably patent and elongate. Tetraspores are thinly
scattered on the inner faces of the pinnules.
10. CalUthamnion conspicuum (Harv.) ; fronde elata incrassata per totam longitudir
corticata et hirsuta decomposite ramosa, ramis conformibus alternis attenuatis repetite alterne divisis, ramulis
solum ecorticatis articulatis dense ramellosis, ramellis quaquaversis alterne pinnatis, pinnis incurvis,
articulis piunularum diametro triplo longioribus, tetrasporis ad latera pinnularum sessilibus solitariis.—
C. tiiigens, Earv. Alg. Exsic. n. 508. Spongodonium conspicuum, Sond. ! in Linn. xxvi. j 5. 515.
H ab. Georgetown.
D ist r ib . South coast of Australia.
Frond 12-18 inches long, the main stem generally undivided, I or 2 lines in diameter, set throughout its whole
length with closely placed lateral branches directed to aU sides. Branches, like the stem, thickly corticated and
shaggy with stupose filaments, 4-1 line in diameter, 6 -8 inches long, repeatedly compounded with alteniate lateral
branches and branchlets. The ultimate divisions, which are from half an inch to an inch in length, are alone visibly
articulate, and are tiiickly clothed with short, pinnulate, incurvéd, articulate ramelli, ou whicli the tetraspores are
borne. Colour a fine carmine, which is quickly given out in fi'esh-water, staining the paper on ivliich the plant may
be dried. Substance very tender, rapidly decayiiig.—The habit of this species is peculiar, and perhaps, with C. plu-
migeritm and 0. superbiens, it might form a separate genus, charactei-ized by the peculiai'ly inarticulate and hirsute
stem. But there are many intermediate links with species of more ordinary characters. The diameter attained by
the stem is greater than in any otlier known species.*
11. Callithamnion laricinum (Harv.); fronde cartilaginea setacea (1-5-unciali) fere ad apices
ramorum corticata glabra quoquoversum ramosa ambitu pyramidali, ramis altérais patentibus superne sen-
sim brevioribus ramulis dichotomo-multifidis undique obsessis, ramulis pluries dichotomis, segtuentis patentibus,
ultimis brevissimis spinmformibus, favellis geminis oblongis simplicibus v. furcatis, tetrasporis globosis
ad latera ramulorum sparsis.— in Trans. E . I. Acad. xxii.^. 562.
H ab. On Zostera, etc. Port Arthur, W. II. II.
D istrib. "West aud south coasts of Australia.
12. Callithamnion dispar (Harv.); fronde pellucide articulata capillari plus minus pinnatim ramosa
disticha, ramis primariis paucis inæqualibus virgatis bipinnatis, pinnis oppositis patentibus inæqualibus
una abbreviata altera elongata pinuulata, pinnulis oppositis æqualibus horizoutalibus crassis multifidis mucronatis,
articuhs ramorum diametro duplo pinnarum sesquilongioribus, pinnularum diametro æqualibus,
tetrasporis ad latera pinnularum sessilibus.—Harv. Alg. Exsic. n. 509.
H ab. East coast ; parasitic on Mijehodea disticha, Gunn.
D ist iu b. Port Fairy, Victoria, IF. H. H.
Fronds solitary or few together, 1-2 inches high, with a simple stem set with lateral branches, a few of which
are long and virgate, the vest reduced to a line or two in length. AU the branches and their divisions aud ramuli
are opposite. The lesser divisions are regularly pinnated, the pinnæ long and short alternately at either side of the
* Since tids was written. I have ascertained that my C. tingens is the same as Sender’s Spongodonium conspi-
cuum, which name will be adopted if the plant be removed from Callithamnion. Another synonym is my Lasiotkalia
hirsnta, in Trans. R. I, Acad. xxii. p. 558, founded on a very imperfect and battered scrap of what I afterwards
called CallUhamnion tingens when more perfect specimens wei-e coUected.