teimissima percursa vel omnino ecostata lineari plana decomposite pinnata, pinnis piimulisque alternis
patentibus axillis rotundatis, ultimis oblongis obtusis simplicibus v. pauce deutatis, ceramidiis lateralibus,
axillaribus vel terminalibus nunc fasciculatis globoso-iiiflatis longiuscule pedicellatis.— Harv. Alg. Exsic.
n. 244. (T a b . CXC. A.)
H a b . Georgetown, rare, R . Gunn, JF. H. H. Southport, C. Stuart.
D i s t iu b . South coast of Austraha.
Frond a foot or more in length, and as much in expansion, about a line or a line and a half in breadth in all
parts, furnished for some inches above the base with a thick cartilaginous midrib, which is gradually dissipated
upwards, the upper half of the frond bemg ribless, and quite flat, but traversed by a very slender, intenial, medial
vein, which is not always visible, though strongly marked in the broader and more luxuriant specimens. The ramification
is distichous, and about thiicc pinnate ; the primai-y branches or pinnæ elongate, few and distant ; the
secondai-y 1 -2 inches long, about half an inch asunder, and regularly alternating ; the tertiaiy short, with one or
two tooth-like incisions. All the hranches and their divisions ai'e remarkably patent, with roimded angles. The
apices are blunt, and frequently as if truncate. The ceramidia are as large as mustard-seeds, globose, on stalks as
long as, or longer than themselves, and are veiy hregularly distributed over the frond, being sometimes terminal,
sometimes on the sides of the smaller ramuli, sometimes in the axils, and sometimes actually fasciculate on different
parts. Their walls are veiy thick, and they contain a large tuft of clavato-pjiiform spores. The colour of the
frond is of a deep clear red, similar to that of many Plocamia.—Mr. Stuart’s specimens from Southport are broader
than that represented in our figure, and the frond is everywhere traversed by a slender medial vein, which we do not
find obrious in the Georgetown plant. It is possible we may confound two species ; but as their vein is less
strongly marked in some individuals than in others from the same locality, we think perhaps it may exist in all, but
from some fault iu the drying may have been obliterated.—P la t e CXC. A. Fig. 1, Ftihnia australasica, nai. size;
2, a fragment, with a pedicellate ceramitlium ; 3, tuft of spores from the same ; 4, some spores separated the latter
figures more or less liighly magnified.
Gen. LV. CLADHYMENIA, Harv.
(Hook, and Haw. Alg. N. Zeal, in Lond. Journ. Bot. iv. p. 54. Haw. Ner. Austr. p. 87. Kutz. Sp. Alg.
p. 879. J. Ag. Sp. Alg. ii. p. 771.)
1. Cladhymenia conferta.—Dictymenia conferta, H irv . Ner. A u sir.p . 29. t. 8 . Delesseria conferta,
Ag. Sp. Alg. \.p . 177. Eucus confertus, R. Br. in Tarn. Hist. t. 184.
Var. 0 .fo liife ra ; ramis folia lanceolata tenui-membranacea ex margine apicibusque emittentibus.
H a b . Georgetown, R. Gunn, IF. H. H. Var. 0 . Southport, C. Stuart.
D i s t r ib . South coasts of New Holland.
During my recent visit to Australia. I ascertained the tetrasporie fi-uit of this plaut, aud am thereby compelled
to remove it from Dictymenia to the present genus. The telraspores foim marginal sori, continued for some distance
along the edge of the frond. Var. ;8 is a remarkable variety, resembling at first sight some states of Delesseria
hypoglossum. It is connected with the common form by specimens of intermediate character.
Gen. LVI. LAURENCIA, Lamour.
(Lamour. Ess. p. 42. Grev. Alg. Brit. p. 108. Harv. Nev. Austr. p. 81. .1. Ag. Sp. Alg. ii, p. 740.)
1. Laurencia F o r ste r i (Grev.; Ilarv. Ner. Austr. p. 8 5 ; J . Ag. Sp. Alg. ii. p. 744).—Fucus
Forsteri, Tarn. Hist. t. 77.
H a b . On Zostera, etc., common.
D is t r ib . All along the coasts of New Holland.
2. Laui-encia filiformis (Mont, PÔ1. Sud, p. 125; Harv. Nor. Austr, p. 8 4 ; 0. Ag. Sp. Alg. ii.
p. 745).—Chondria filiformis, Ag. Sp. Alg.
I I a b . Tasmania, according to Alontagne.
D i s t r ib . West coast of New Holland.
We are not acquainted ivith this plant.
3. L aurencia obtusa (Lamour.; Grev. Alg. Brit. p. I l l ; Harv. Phyc. Brit. t. 148; J . Ag. Sp.
Alg. ii. p. 750).—Fucus obtusus, Turn. Hist. t. 2 1 ; Eng. Bot. t. 1201.
H a b . Georgetown.
D i s t r ib . Atlantic shores of Europe and America. Tropical seas.
4. Laur encia Tasmanica (Hook. fil. efc Harv. in Harv. Ner. Austr. p. 84).—L. papillosa, Harv.
in Lond. Journ. Bot. v \.p . 401 {excl. s yn ).
H a b . Plentiful at Georgetown.
5. L aurencia b otryoid es (Gaill. ; Harv. Ner. Austr. p. 82).—Fucus botryoides, Tui-n. Hist
t. 178.
H a b . Georgetown, Gunn. Derwent, Eoing, Oldfield. Southport, Stuart.
6 . Laurencia elata (Ilarv. iu Hook. Lond. Journ. Bot. vi. p. 401 ; Harv. Ner. Austr. p. 81. t. 33 ;
Kiitz. Sp. Alg. p. 856 ; J . Ag. Sp. Alg. ii. p. 766).
H a b . Georgetown and Port Arthur.
D i s t r ib . All along the coasts of New Holland.
Gen. LVII. CHAMPIA, Ag.
(Harv. Ner. Bor. Amer. ii. p. To .— Cliampioe et Lomentaria sp., Auct.)
1. Champia Tasmanica (Haw. in Hook. Lond. Journ. Bot. iii. p. 407. t. 1 9 ; Harv. Ner. Austr.
p. 78; J. Ag. Sp. Alg. ii. p. 370).
H a b . Georgetown, Gunn, IF. H. //., etc. Derwent, Oldfield.
2. Champia affims (Harv.).—Chylocladonia affinis, Hook, et Harv. Lond. Journ. Bot. vi. 77. 402;
Harv. Ner. Austr. p . 79. t. 29. Lomentaria affinis, Kiitz. Sp. Alg. p. 863; J . Ag. Sp. Alg. ii.p . 730.
H a b . Common at Georgetown and elsewhere.
D i s t r ib . Shores of New Holland and New Zeaiaud.
3. Champia ob sole ta (Harv.) ; fronde pyramidali paniculatim ramosa, caule subsimplici intestini-
formi obsoletissime constricta v. subcontinua, ramis lateralibus quaquaversis oppositis vel verticillatis crebre
ramosis, ramulis decompositis, articulis ramulorum vix conspicuis diametro sesquilongioribus, ceramidiis
ovatis sessilibus.—Harv. Alg. Exsic. n. 252.
I I a b . Georgetown. Southport, C. Stuart.
D i s t r ib . Port Fairy, Victoria, W. H. H.
Perhaps only a variety of C. affinis, but the habit is somewhat different, and the articulations difficult to be
seen iu any part of the frond, owing to the thickness of the outer walls. The plant grows on tidal rocks, in stial-
loiver water tlian i . affinis, and is generally, from exposui-e to sunlight, of a dull livid-greeii, tipped with purple.
4. Champia panm la (Ilaw. Ner. Bor. Amer. pt. 2. p. 76),—Chylocladia parvula, Grev.; Harv.
Phyc. Brit. t. 210; Ner. Austr. p . 80. Lomentaria parvula, J . Ag. Sp. Alg. i i.7;. 729.
H a b . Georgetown.
D is tu ib . Northern Atlantic and Mediterranean. Coasts of New Holland and New Zealand.