and H. obccmica of Kiitzing, cannot be kept specifically distinct. The characters attributed to them by authors
depend partly on age, but chiefly on differences in depth of water, and exposine. II. Sieberi commonly grows iu
tidal rock-pools, and H. Banksii and Labillardieri on stones about low water-mark, the latter occuning in deeper
water than the former.
Gen. X. CAIiPOGLOSSUM, Kiitz.
(Kiitz. Fhycol. p. 852 ; J. Ag. Sp. Alg. p. m .—Platythalia, Sender in Bot. Zeit. 1845, p. 51.)
1. Carpoglossum confluens (R. B r .; Kiitz. Phyc. p. 3 5 3 ; J . Ag. Sp. Alg. i. p. 195).—Focus
confluens. Turn. Hist. t. 141 ; Harv. in Lond. Journ. Bot, vi. p. 4 1 3 .
H a b . Port Arthur, Lyall, W. H. H. Common.
D i s te ib . South coast of New Holland. Port Phillip and Western Port, JF. H. H.
Gen. X I. MTRIODESMA, Bne.
(Dne. Arch. Mus. ii. p. 148 ; Endl. 3rd Suppl. p. 29 ; J. Ag. Sp. Alg. i. p. 191.)
1. Myr iode sma integrifolium (Harv.) ; caule basi terete sursum plus minus alato, costa evanescente,
phyllodiis distichis decomposite pinnatifidis, laciuiis enervibus linearibus obtusis margine integerrimis
V. apicem versus minute denticulatis, scaphidiis numerosissimis sparsis. — Harv. Alg. Exsicc. n. 4 3 .
(Tab. CLXXXYI.)
H a b . Georgetown, JF. E . H.
D i s t r ib . Geelong and Western Port, Yictoria.
Frond 1-2 feet long. Stem, cylindrical, cartilagineo-coriaceous, branched near the base, its principal divisions
becoming more aud more compressed upwards, then winged, then passing into a lamina traversed hy a slender
midrib which gradually disappears toward the summit. These main dirisious are distichously branched, and their
branches repeatedly pinnatifid, with rounded axils, and are destitute of midrib except toward the base of the principal
rachides. The laciniæ are 1-2 lines broad, linear, membranaceous, quite entire at the margin, or remotely
denticulate, especially toward the apices. Scaplddia very numerous, densely scattered over the whole frond. Colour
ohvaceous or foxy.—P l a t e CLXXXVI. Fig. 1, the frond, natural size; 2, apex of a fertile lacinia; 3, section
through the same and tliiough spore-cavities ; 4, a spore the latter figm-es n
Gen. X II. SARCOPHYCUS, Kiitz.
(Kutz. Phyc. p. 392; Sp, Alg. p. 587 ; J. Ag. Sp, Alg. i. p. 189.)
1. Sarcop h ycu s p otatorum (Labill.; Kiitz. Sp. Alg. p. 587 ; J . Ag. Sp. Alg. i. p. 190).—Fucus
potatorum, Labill. Nov. Holl. p . 112. t. 257; Turn. Hist. t. 242.
H a b . Western and northern coasts.
D is te ib . South coasts of New Holland.
Gen. X I II. SPLACHNIDIUM, Grev.
(Grev. Syn. p. 36 ; J. Ag. Sp. Alg. i. p. 186 ; Kutz. Sp. Alg. p. 585.)
1. S plachnidium rugosum (Grev.; J . Ag. Sp. Alg. i. p. 1 8 6 ; Kiitz. Sp. Alg. p. 585).—Fucus
rugosus, Linn. Mant. p . 3 1 1 ; Turn. Hist. t. 185; Ilarv. Fkye. Austr. t. 14.
H a b . Tidal rocks, near low water-mark. Georgetown, Gunn, JF. II. II., etc.
D i s t r ib . South and east coasts of New Holland. New Zealand. Cape of Good Hope.
Gen, XIV. NOTHEIA, B a il et Harv.
(Bail, et Harv. in Wilkes’s Amer. Expl. E x .; Harv. in Hook. PI. N. Zeal. ii. p. 215.)
1. N o th e ia anomala (Bail, et Harv. 1. c . ; Harv. in Hook. FI. N. Zeal. ii. p. 216. t. 109 A).
H a b . Parasitic on Hormosvra Banksii, very common.
D i s t r ib . South and east coasts of New Holland. New Zealand.
Tribe I I . SFOROCHNACEAA.
Gen. XV. SPOROCHNUS, Ag.
(Kiitz. Phyc. p. 342; J. Ag. Sp. Alg. i. p. \lZ.~Sporochni sp., Auct.)
1. Sporochnus comosus (Ag. Syst. p. 2 5 9 ; J . Ag. Sp, A l g . i .p . l 7 4 ; Kiitz. Sp. p. 569).
H a b . Georgetown, R . Gunn, JF. H. II., etc.
D is tiu b . Coasts of New Holland.
To this place we refer a species common at Georgetown, but which varies much in the relative lengths
of the pedicel and receptacle. In the normal state, described by Agardh, the pedicel is fom- times shorter than
the receptacle, and so we find it in some specimens. In others, and even on different branches of the same
frond, we find pedicels half as long, as long as, or longer than their receptacle. Either, therefore, we must
refer aO to one head, or establish four or five new names on the specimens before us. This latter could be
easily done had we but a few examples to decide from; but after examining some hundi-eds collected at King
George’s Sound and Georgetown, we are forced to unite all under one head. When this plant grows in shaUow
water, it is frequently bushy, the branches much divided; hut when, as at Georgetown, it inhabits the deeper parts
of the Tamar, iu a rapid tideway, the priinaiy branches are neaily simple, and lengthened to two feet or more.
Some of our specimens answer to the description given of Sp. Gexi'tneri, a species of which we have seen no
specimen.
2. Sporochnus H e r cu leu s (J. A g .); “ fronde cylindracea ramis simpliciusculis virgata, recepta-
culis longissimis cylindraceis subclavatisque in pedicellum ipsis breviorem longe attenuatis.” J. Ag. Sp.
Alg. i. p . 175.
H a b . Georgetown, Gnnn, fide J. Agardh.
This species, which is very imperfectly known to us, is founded by Professor J. Agardh on a specimen w-hich
we formerly inadvertently sent him for S. radiciformis, but nothing similar to wiiich have we been able to find
eitiier in Mr. Gmm’s extensive collection or in our own. Professor Agardh has obligingly returned a fragment
to Dr. Harvey. Tliis agi-ees with the diagnosis given, and certainly differs from any of the innumerable specimens
of S. comosus which have come before us. The species must remain, therefoi-e, for future elucidation.
3. Sporochnus radiciformis (R. B r.; J. Ag. Sp. Alg. i. p. 1 7 5 ; Harv. in Lond. Journ. vi.
p. 4 1 5 ; Kütz. Sp. Alg. p. 568).
H a b . Georgetown, Gicnn, JF. H. H., etc.
D i s t r ib . South and west coasts of New Holland.
4. Sporochnus apodus (Harv.); fronde setacea longissima decomposite ramosa, ramis filiformibus
simpliciusculis receptaculis cybudraceis apice subacutis sessilibus liorizontaliter patentibus.
H a b . Georgetown, JF. H. H.
Of this remarkable plant we have, as yet, seen but a solitary specimen, but this is so strongly characterized
that we must, for the present, hold it to be a species. It consists of part of a stem, 8-10 inches long, closely set