Hab. Southiwrt, C. Stuart.
D is tiu b . Coast of Victoria,
More slender than P . LaUllardieri, with flatter, less distinctly-ribbed hranches, and readily known, when in
fruit, by the position of the nmathecia, which arc sessDe near the tips of the maiginal pectinate teeth or lacinula;.
The Tasmanian specimens are not so broad as those from Victoria, and are more deeply indso-pectinate, but they
perfectly agi’ec in the more important characters of the fructification.
T r ib e VI. SQUAMARIEÆ.
Gen. LXX. PEYSSOKNELIA, Dene. '
(Dene. PI. Arab. p. 168. Endl. 3rd Suppl. p. 38. Kütz. Phyc. p. 384. J. Ag. Sp. Alg. ii. p. 499.)
1. P e y s s o n n e lia r u b r a (J. Ag. Sp. Alg. ii. p. 502).—Zonaria rubra, Grev. in Lin. Trans. 15. ii.
p . 340. P . orbicularis, Kiitz. Phyc. p . 385.
H a b . On stones : at Georgetown.
D i s tb ib . Mediterranean. Pacific Ocean.
I Lave ventured to refer the Van Diemen’s Land specimens to P. ruira, a species of the Mediterranean, fron»
which perhaps a more accurate examination of authentic spedmens would separate them. The general habit of our
Tasmanian spedes is that of P . rubra, but the size ia greater, and the substance less thin and delicate. I also
found this plant at Eottnest Island, W. Australia, aud iu Port Jackson, and have received it from the coast of Victoria,
from Dr. Curdie. It is very distinct from P . australis, Sond., and P. Novce-Hollandux, Kütz.
2. P e y s s o n n e lia a u s t r a l is (Sond.); “ frondibus aggregatis basi aduatis estipitatis coriaceis coccineo-
purpureis (demum virescentibus) integris rcl obtuse sublobatis obsolete zonatis subtus pallidis radiculis
tenuissimis tomentosis versus marginem glabris, verrucis fructiferis sparsis (non zonatim dispositis) pur-
pujeis.”—Sond. in Linn. xxv. p . 685 ; Earv. Alg. Austr. Exsicc. n. 328 ! Earv. Phyc. Austr. t. 81.
H a b . Tasmania, C. Stuart.
D i s te ib . Native of the coast of Victoria, F. Mueller, JF. E . E .
Fronds 4 inches long and 5 inches wide, thick and coriaceous, flabelliform, either undivided or cut into two
or tliree shallow lobes, emitting from the under-surface, toward the base, several scattered, stout roots, and densely
clothed over the greater part of the inferior sui-face with a pale-brown ov fulvous tomentum. A broad, glabrous
margin extends round the frond beneath the apices of the lobes. The upper surface is smooth, aud marked with
eoucentrie zones ; the margin thin, and frequently revolute. The colour is a deep blood-red, darker toward the
base. The substance of the frond is singularly thick and leathery.
1
T r ib e VII. GEL1DIACEÆ.
Geu. LXXI. GELIDÏUM, Lamour.
(J. Ag. Sp. Alg. vol. Ü. p. 466. Fl. N. Zeal. ii. p. 243.)
1. G e lid ium co rn e um (Lamour; Harv. Phyc. Brit. t. 53 ; J . Ag. Sp. Alg. ii. p. 469 ; Kütz. Sp.
Alg. p. 764).—Fucus comeus, Turn. E is t. t. 257.
H a b . On tid a l rocks.
D i s t r ib . Cosmopolitan.
5Ve have not seen any specimens of the ordinaiy form, but the varieties caspitosa and erinalis are common on
stones between tide-marks, at Port Arthur, aud probably in other suitable localities.
2. G e lid i« I (Grev. ; Kiitz. Sp. Alg. p. 475 ; J . Ag. Sp. Alg. ii. p. 475).
H a b . Georgetown, Gunn.
D i s t r ib . South coast of Australia.
8. G e lid ium g laa d u lse fo lium (Hook. fil. et Harv. in Lond. Journ. vi. p. <
p. 4 7 4 ; Kütz. Sp. Alg. 7 6 6 ; Phyc. Austr. t. 18).
H a b . At Circular Head, Mrs. Smith. Georgetown, JF. E . E .
D i s t r ib . South coast of Australia.
6 ; J . Ag. Sp. Alg. ii.
Gen. LXX II. NIZYMENIA, Sond.
(Sond. in Linn, xxvi, p. 520.)
1. N . a u s t r a l is (Sond. 1. c.).
H a b . Southport, C. Stuart.
D i s t r ib . Wilson’s Promontory, Dr. Mueller. Port Phillip Heads, JV. H. H.
Root a large, expanded, fleshy disc. Stems many from the same base, 4-6 inches high, about 1 | line in
rapressed and thickened below, flattening upwards, much branched in an irregularly pinnate, twice or
thrice decompound order. Pinna and pínnula patent, opposite or scattered, linear, obtuse, much constricted at
their insertion as if stalked; the smaller ones resemblmg leaflets. Apices either rounded and very obtuse, or minutely
notched. Margin quite enthe and flat. Colour a fine clear red, becoming brighter in fi'esh-water. Substance rigid
wheu diy, tough, coriacco-corneous. Structure very dense; the medullary stmctuie composed of closelv-interlaced
filaments occupying tb'ee-fourths of the breadth; the intermediate cells rather small.—In distributing my Australian
Alga, several specimens of this plant were inadvertently sent out under n. 385, as " AreseJiougia conferta.”
The plant originally so named by me is different, and a true Areschougia. The present plant bears a striking external
resemblance to it, but is broader, more regularly pinnate, and destitute of costa, and the internal structure
quite different. I have not seen the fruit, which is described by Sender in the memoh above quoted.
Gen. LX X III. HYPNEA, Lamour.
(J. Ag. Sp. Alg. ii. p. 438. Kütz, Sp. Alg. p. 738.)
1. H y p n e a se ticT jo sa (J. Ag. Sp. Alg. ii, p. 446).—H. cliaioides, S m i. Eooh. f i . et Harv. Alg.
Tasm. Lond. Journ. vi. p . 406.
H a b . Georgetown, B . Gunn, JF. E . E ., etc.
D i s t r ib . Coasts of Australia, Japan, China, and the Pacific Islands.
2. H y p n e a e p is c o p a lis (Hook. fil. et Harv. Lond. Journ. vi. p. 406 ; J . Ag. Sp. Alg. ii. p. 4 4 3 ).
H a b . Georgetown aud Port Arthur.
D i s t r ib . West and south coasts of Australia.
3. H y p n e a p la n ie a u lis (Harv.) ; fronde latolineari plana subdistiche ramosissima decomposite
pinnata, ramis majoribus applanatis seticulosis crebre bi-tripinnatis, pinnis pinnuHsque gracilibus paten-
tibus subulatis acutis nunc apice iucrassatis cirrhoso-hamatis, cystocarpüs globosis infiatis ad latera piniiu-
larum sessilibus.—Earv. Alg. Exsic. n. 342.
I Iab. Georgetown.
D i s t r ib . South coast of New Holland.
Fi-onds densely tufted, 8-12 inches high, and as much in expansion, excessively decompound in a pretty
regularly distichous pinnate order. Main stem quite flat, one to two lines in breadth, having several lateral similar