sùbpalmatifida dilute rubra membranacea, margine simplici, cystocarpiis numerosissimis per totam frondem
sparsis.
H a b . East coast, R. Gum.
Fronds tufted, on a short filiform stipes, broadly euneate, 4-6 inches long and 3-1 wide, vertically cleft in a
subpalmate manner, the margin flat and without lobes. Substance membranaceous, thin. Colour a fugacious red,
changing to greenish. Cystocarps veiy numerous.—Wc have seen but few specimens, hardly sufficient to establish
the species, and yet we do not know to what other species to refer them. They do not accord with any state of
R. polymorpha, aud yet they approach that species, especiaUy in the fructifled specimens. In external habit therc
is a near resemblance to some forms of R.palmata, but the structure aud colom- are different.
T r ib e XI. CRYPTONEMIACEÆ.
Geu. LXXXV. DASYPHLOEA, Mont.
(Mont. Prod. Phyc. Aut. p. 8 . Voy. PÒI. Sud, p. 100. Kütz. Sp. Alg. 757. J- Ag. Sp. Alg. ii. p. 215.)
1. D a s y p h loe a T a sm a n ic a (Hook. fil. et Harv. Lond. Journ. Bot. vi. p. 4 0 6 ; J. Ag. Sp. Alg. ii.
p. 2 1 6 ; Harv. Phyc. Austr. t. 115).
Hab. Georgetown, rare, Mrs. Smith.
D is t r ib . South coast of Australia, Curdie, W. H. H.
Gen. LXXXVI. GULSONIA, Harv.
(Harv. in Ann. Nat. Hist. xv. p. 334.)
Frons gelatinoso-membranacea, teres, nodoso-anuulata, decomposite ramosa, ex tubo centrali amplo
articulato monosiplionio filis anastomosautibus longitudinalibus laxe circumdato, et filis horizontalibus excurrentibus
dichotomis fastigiatis muco hyaliuo firmiori iuclusis constituta. Fructus . . .
1. Gulson ia annulata (Harv. I.e. p. 334). (T a b . CXCIII. A.)
H a b . Georgetown, rare, JF. H. H.
D is t r ib . Western Port, Victoria.
Fronds densely tufted. 6 -8 inches long, decorapoundly much branched ; the branches and their divisions and
ramuli irregularly scattered, aU tapering to the base and apex, and aU annulariy constricted at short inteivals; the
nodes swollen and deeply coloured; the intemodes pale, Uke veiy narrow transverse rings. A cross section shows a
very large central tube, surrounded by a narrow stratum of longitudinal filaments, from which radiate toward the
circumference dichotomous, caUithamnoid, fastigiate filaments, whose branches are separated by peUucid jeUy of firm
consistence, a layer of which also forms a peUucid envelope of the branch. A longitudinal section shows that the
central tube is septate, the septa at intervals of 7 or 8 diameters apart, and that the longitudinal filaments anastomose
into a laxly netted, filamentous sheath, enclosing the central tube. The filaments of the peripheiy are thrown
off irregularly from the outer face of the sheath. Colour a fine pinky-red, given out in fresh-water. Substance very
soft.—Until the fruit shaU be discovered, the position of this genus must be doubtful. At present I am disposed to
think it allied to Catenella. It may also be compared with Gloiopeltis, Endocladia, and Ga/fytz.—P la t e CXCIII. A.
Fig. 1, a frond, nat. size; 2, transverse semisection ; 3, peripheric filaments ; 4, longitudinal section the latter
figures magnified.
Gen. LXXXVII. ARESCHOUGIA, ilarv.
(Harv. in Trans. R. I. Acad. xxii. p. 554.)
ifroas linearis, compressa, immerse costata, distiche ramosissima, e filo cenlrali articúlalo et stratis
tribus cellularum constituta; stratum medullare e lilis articulatis longitudinalibus anastomosautibus laxe
intertextis, intei-medium cellulis rotundis majusculis pluriseriatis, corticale cellulis minimis verticalibus
formatum. Cystocarpia fronde immersa, inter fila strati intermedii suspensa, reticulo filorum velata,
carpostomio demum aperta, fila sporifera a placenta centrali emissa continentia ; spora subrotundæ,
seriatæ.
1. A r esch ou g ia Laurencia (Harv. 1. c. p. 554).—Thamnocarpus ? Laurencia,//ot?/./ / . et Harv.
Lond. Journ. Boi. \ \ .p . 409.
H ab. Georgetown, abundant. Southport, C. Stiiart.
D istrib. West aud south coasts of Australia.
Tins plant lias the habit of a Rhabdonia, but is more firm in texture, and essentiaUy differs in structure by
having a central articulated filament or axis, of larger diameter than that of the longitudinal filaments composing
the medullary stratum.
2. Ar esch ou g ia S tu a rtii (Harv.); fronde plano-compressa dense ramosa decomposito-pinnata,
pinnis basi et apice angustatis, pinnulis fere lanceolatis utrinque acutis erecto-patentibus cystocarpia immersa
gerentibus.
H ab. Southport, C. Stuart.
Frond distichously much branched in a subpinnate manner, and repeatedly compound, 3-6 inches long, and as
much iu the expansion of the branches; the branches and pinnæ close together, erecto-patent, nan-ow-iinear, nearly
flat, with an evident immersed costa tapering to the base and apex, the lesser ones with an acute point, and nearly
lanceolate in form. Tlie lower part of the stem and larger hranches is thickened. Colour a bright-red, becoming
scarlet in fresh-water. Oystocarps minute, immersed in the substance of the lanceolate leaves, one or two in each
lamma. The medullary stratum of the frond is very lax.—Nearly related to A. australis, but narrower, more
densely branched, with a much laxer internal straeture, the filaments composing the meduUary stratum being few,
and standing far apart from each other. It has more the habit of A. conferta, but its structure is even more different.
From aU forms of A. Laurencia it may be known by its flatness.
Gen. LXX XVIII. RHABDONIA, Harv.
(Harv. in Lond. Joum. Bot. ri. p, 4 0 8 . Kutz. Sp. Alg. 723. J. Ag. Sp. Alg. ii. p. 353.)
1. Rhabdonia coc cinea (Harv. Lond. Journ. Bot. vi. p. 4 0 8 ; Kiitz. Sp. Alg. p. 723; J . Ag. Sp,
Alg. ii. p. 354 ; Harv. Phyc. Austr. t. 54). — Chrysymcnia coccínea, Earv. Lond. Journ. Bot. iii
p . 448.
H ab. Georgetown, Gunn.
Dist r ib . Port Phillip.
2. Rhabdonia n ig r e sc en s (Hook. fil. et Harv. Lond. Journ. Bot. vi. p. 4 0 9 ; J. Ag Sp Alg ii
p. 854).
H ab. Georgetown, Gunn.
D istrib. South coast of New Holland.
I fear I have led my friend Sonder into en-or by distributing to liim a wrongly marked specimen of one or
other of these nearly allied, but, as 1 still think, distinct species. C. coccinea is of a ranch softer substance, and
becomes of a brilliant crimson colour « hen steeped in fresh-water. C. nigrescens is rigid, very imperfectly adheres
to paper, nnd is always of a dull, dark, brownish-red colour, even after exposure to fresh-water. I Lave coUected
botli species abundantly, and can always distinguish them when growing. C. coccinea has a more evident stem, and
its branching is somewhat pyramidal : C. nigrescens is bushy, branched from tlie base.
VOL. I I . 4 J,