branches, which like it are densely bristled with short, spinelike ramuli. The ■main branches are three ov four times
pinnate ; the pinna 1-3 inches long, compressed, I—^ line in diameter, tapering to the apex, and closely set with
subulate pinnulæ, whicli are often again pinnulate. As in all the genus, some of the pinnulæ are lengthened out
into cirrhous branches, thickened and hooked at the end. The colour is a full-red, becoming brigbt-scarlet on
steeping in fresh-water. The substance is soft, and the plant adheres firmly to paper in drjdng. The cystocarps
are globose, of large size, and scattered on the pinnules.
This appears to us to be a strongly-marked species, readily distinguished by its flattened stem. It is move
.abundant at Western Port and on the coast of Victoria than in Tasmania.
Gen. LXXIV. SOLIERIA, J. Ay.
(J. Ag. Alg. Medit. p. 156. Endl. 3rd Suppl. p. 53. Kiitz. Sp. Alg. p. 7-18. J. Ag. Sp. Alg. ii. p. 721.)
1. S o lie r ia a tis tr a lis (Harv.) ; fronde dendroidea (1-2-pcdali) robusta decomposite ramosissima,
ramis alternis sparsisve approximatis pluries alterne compositis, ramulis ultimis linearibus acutis basi attenuatis,
cystocarpiis in ramulis semi-immersis.— Ilarv. in Trans. R . I . Acad, xxii. 73. 552; Rarv. Alg.
Exsic. n. 34G.
H ab. Georgetown.
D ist e ib . Western Australia.
Much larger in all its parts and more branching thau S. chordalis, with less tapering branches, and a firmer
and more fleshy substance. The Georgetown specimens are still larger thau those from Western Australia.
T r ibe V I II. CHÆTANGIEÆ.
Gen. LXXV. CHÆTANGIUM, KUiz.
(Kiitz. Phyc. Gen. p. 392. Sp. Alg. p. 792. J. Ag. Sp. Alg. ii. p. 458. Nothogenia, Mont. An. Sc. Nat.
1 8 4 3 , p . 3 0 3 .)
1. CHsetangium ? (N o th o g e n ia ?) fia h e lla tum (Harv.) ; fronde cartilagineo-cornea lucida rubra
angustissime lineari compressa regulariter dichotoma fastigiata, segmentis patentibus ilabellatim expansis
pluries furcatis, apicibus obtusis.
Hab. Port Arthur, TF. E . E . Tasmauia, C. Stuart.
Root scutate. Fronds densely tufted, 2-3 inches high, fastigiate, many times dichotomous, the lower forkings
distant, the upper closely approximated ; the ultimate segments sometimes short, sometimes lengthened out and
filiform, always obtuse. The frond is strongly compressed, almost flattened, but veiy narrow, not more than | line
in breadth. The colour is rather a bright puiplish-red, and the surface somewhat shining. The substance is very-
similar to that of Gelidium corneum or cartilagineum. No fruit seen, and the genus therefore doubtful.—The internal
structure of the frond is very similar to that of CJiatamgium varhhsum, which also agrees with our plant iu
ramification ; but our plant is much narrower, of a brighter colour, and more homy substance.
2. C h æ ta a g inm ? lA n g n la (Harv.) ; fronde pusilla simplici vel semol furcata plana lanceolata cartilagineo
cornea siccitate rigida basi e t apice attenuata obtusa, strato interiore filorum laxiore, peripherico
(lensissimo, cystocarpiis numerosis per frondem sparsis.
H a b . Ou rocks : Brown’s River, Gunn.
Fronds tufted, an inch or two high, about two lines broad, flat, lanceolate, either quite simple or once forked,
very rigid when dry, tapering to each end, the apex blunt. The interior stratum of the frond is much more lax
than in other species of the genus, and the exterior stratum more dense. The structure of the cystocarp is that of
CIuBtangium.—Our specimens are covered with fruit, and therefore, we suppose, full-grown.
Gen. LXXVI. ACROTYLUS, / . Ag.
(J. Ag. Sp. Alg. vol. ii, p. 192.)
1. A c ro ty lu s au stralis (J. Ag. Sp. Alg. ii. p. 193; Harv. Alg. Essie, n. 3 3 0 ; Phyc. Austr. t. 99).
H a b . Tasmania, C. Stuart.
This plant iias got the cystocaipic fruit of a Ckatangiurn, to which genus the present is closely allied in habit,
but has a somewhat different cellular arrangement. The two genera might be united without much violence.
T ribe IX. EELMINTHOCLA BIEjE.
Gen. LXXVII. SCINAIA, Bivona.
(J. Ag. Sp. Alg. ii. p. 420.— Ginannia, Mont. Harv. Phyc. Brit. t. 69.)
1. S c in a ia furc ellata (Bivon. ; J . Ag. Sp. Alg. ii. p. 4 2 2 ).—Giuannia furcellata, ; Earv.
Pl/yc. Brit. t. 69; Lond. Journ. vi. p . 407. Ulva furcellata, E. Bot. t. 1881-
H ab. Georgetown, rare, R. Gtinn. Derwent, Oldfield.
D ist r ib . Native of temperate and subtropical seas, north and south.
Gen. LXXVIII. LIAGORA, .
(Umour. Polyp. Flex. p. 235. Endl, 3rd. Suppl. p. 22. Kütz. Sp. Alg. 537. J- Ag. Sp. Alg. ii. p. 424.)
1. Liagora v iscida (Ag. Sp. Alg. i. p. 395 ; J . Ag. Sp. Alg. ii. p. 425).—Eucus viscidus ?, Turn.
Hist. t. 119 [excl. syn.).
H ab. Georgetown, common.
D istr ib. Mediterranean Sea. Also in the tropical oceans, east and west.
Gen. LXXIX. GALAXAURA, Lamour.
(Lamour. Polyp. Flex. p. 259. Kütz. Sp. AJg. p. 529.)
1. Galaxaura obtusata (Lamour. Pol. Elex. p. 262 ; Kütz. Sp. Alg. p. 529).
H ab. Tasmauia, Eerb. Greville.
D ist e ib . Tropical and subtropical seas.
T ribe X. REODTMENIACEÆ.
Gen. LXXX. PLOCAMIUM, Lainour.
(Harv. Ner. Austr. p. 121. J . Ag. Sp. Alg. ii. p. Z n .— Thamnop]iora, Ag.)
(urn coccineum (Lyngb. Hyd. Dan. 39. t. 9 ; Harv. Phyc. Brit. t. 44 ; Fl. Antarct. i.
g. ii. p. 395).—Fucus coccineus, Turn.
1. Plocamii
p- 186, and ii. p. 4 7 4 ; Fl. N. Zeal. ii. p. 245 ; J . Ag.
Eist. t. 5 9 ; E. Bot. t. 1242.
Var. 0 . fiexuosuni, Harv. Ner. Austr. p. 124. t. 43.
H ab. Sea-shores. 0 . In the Tamar, above Georgetown,
D istr ib . The commou form is cosmopolitan.
Our var. 0, called by Tasmanian collectors “ the lace-patternf is a very remarkable and beautiful form of the
speeies. not found anywhere else that we arc aware of than at Georgetown. It fonns large globose tufts, the fronds
lying one ou another like the leaves of a book. The branching is pretty regularly dichotomous and fastigiate, the