isimple
stems, destitute of branches, and merely clothed with patent subulate ramuli, rise from creeping filaments ;
such indiriduals are fr-om F - l inch liigh. But, when larger, lateral branches begin to be developed, in every respect
similar to the main stem. In one specimen, 3F inches long, which alone is in fi-uctification, the branches are I - IF
inch in length. The variety /3 is a remarkable one, and possibly a distinct species, it is smaUcr and slenderer, with
the branches much curved and the ramuli vei-y generally secund.
P late LXXVI. Fig. II.—1, portion of a branch; 2, the same with ceramidia; 3, section of stem; 4, ceramidium;
5, spores:
7. PoLYSiPHONiA decipiens, Mont. ; “ cæspitosa, fragilissima, filis cylindraceis subcontinuis fusco-nigris
irregulariter virgato-ramosissimis, ramulis erectis, spinis subulatis spiriditer alternis strictis, articulis diametro
multoties brevioribus ex siccatione coUapsis S-5-venosis; fructu . . . . ?” Mont. Prodr. Phyc. Antarct. p. 5.
Toy. au Pole Sud, Bot. Crypt, p. 131.
H ab . Lord Auckland’s group. [Admiral DXJrville.)
8. PoLYSiPHONiA cladostephus, M o n t.; “ filo primario articulato polysiphonio vage ramosissimo fusco-
purpureo nigrescente, ramis conformibus e genicubs rameUos verticillatos dicliotomos monosiplionios dense
imbricatos emittentibus, fructu . . . . ? ” Mont. in Ann. des Sc. N a t. (Nov. 1843), p. 39. Voy. au Pole Sud,
Bot. Crypt, p. 132. 1 .13. f. 4.
ILab. Lord Auckland’s group. {Admiral D Urv ille .)
Apparently nearly related to P. byasoides, Grev., and stib more closely to P. byssoclados, Harv. {Giiffithsia
australis, Ag.)
15. JA N U ,
1. J akia Homhronii, Mont., Voy. au Pole Sud, Bot. Crypt, p. 146.
H a b . Lord Auckland’s g ro u p ; on rocks in tb e sea, abundant.
What we take for Montague’s plant much resembles tbe Corallina officmalis, L.; we are not, however, well
versed in these vegetables, which have only recently been skilfully investigated by Decaisne.
16. LA U R EN C IA ,.
1. L aurencia pinnatifida, Lamour.; var. y, angusta. Eucus Turn. H is t. Fuc. vol. i. p. 40.
H a b . Lord Anckland’s g ro u p ; on rocks in tb e sea.
17. DELE SSERIA,
1. D elesseria crassinervia, Mont.; caule alato ramoso, fobis lineari-lanceolatis e costa vabda proliferis,
capsubs in costa sessibbus, soris spbærosporamm Hnearibus costæ parallebs. J). qrassinervia, Mont. Prodr.
'C .A n t . ^ . l .
H ab . Lord Auckland’s group and CampbeU’s Island.
We have some doubts as to tbe validity of this species, wliich differs from D. Hypoglossum only in the comparative
breadth of its costa ; a somewhat inconstant character, being, at times, excessively broad, covering nearly
tbe whole lamina, at others, nearly, if not quite, as narrow as in D. Hypoglossum. These intermediate foms do not
exist among our CampbeU’s Island individuals, but in those from tbe Ealklands.
2. D elesseria dichotoma, Hook. fil. et Harv.; costa crassa dichotoma frondem cuneatam obtusam v.
emarginatam demum bifido-laciniatam percurrente infra apicem evanida, frondibus e costa denudata oricn-
T
tibus oblongis cuneatis rariusve elliptico-lanceolatis costa furcata, soris rotundatis maculatis, coccidiis costa-
libus V. sparsis. (T a b . LX X I. K g . II.)
H ab. Lord Anckland’s group and Campbell’s Island. (Br. LyaU.)
From junior, folium obovatum, obtusum v. emarginatum, demum bUobum; costa furcata, demum repetito-
dicbotoma, deorsum crassa, sursum atteuuata, sub apicem evanida. Frondes adnltæ fni'catus v. dicbotomus,
2-3 unc longus, setæ porcinæ crassitie. nudus v. interruptim alatus, superne in frondes cuneatas v. dicbotomas
abenns- inferne denudatus v. frondibus ncvis primordiab conformibus sed angustioribus nunusque cuneatis ornatus.
bæ u ’une lono-æ, costis supra medium furcatis fructiferis. Coceidia in laminam rarius m costam sita, spbænca,
s p a r s a ', g r a n u l i s limeatis repleta. Sori sphoerosporarum votrmAsA.i, supra laminam dispersi. membranacea.
Color pui-pureo-roseus v. sanguineus.—Chartæ adhæret.
Wlien fidly grown, this species resembles a very broad and luxuriant state of B. alata, found in tbe north of
Ireland but differs essentially from it in its mode of growth. Judging by young specimens, it appears to originate
in a broadly ovate or cuneate leaf, traversed by a forked, or, as the frond advances, repeatedly dichotomous midrib,
wliicb thouMi o-raduoUy evanescent, is obvious for nearly tbe whole length of tbe lamina, and thus differs from tbe
imperfectly branching veins of the Nitophylla. In old and battered specimens, however, this character can only be
detected in tbe yoimg parts; in them, tbe costa of tbe first fomed leaf becomes denuded, considerably thickened
and converted into a dichotomous stem, iiregnlarly winged in portions, and only preserving, on tbe upper part, the
remains of its former character; while. aU along its denuded portions, spring numerous new fr-onds. narrower than
that which forms the principal one, and less cuneate, but in other respects sumlar.
P late LXXI. Fiy. II.—1, 2, and 3, specimens in different states, of the natural size; 4 and 5. coceidia;
6 and 7, sphærospores:—magnified.
18. N ITO PH Y L LUM , Grev.
1 . N i to p h y l lu m crrispatum, Hook. fil. et Harv.; fronde basi nervosa cuneata latissime expanse v.
oblonga dichotoma v. laciniata margine crispata, nends ramosis, laciniis cuneatis apicibus axiUisque obtusis,
soris minutis rotund-atis coccidiisque sparsis. (T a b . LX X I. H g . I.)
H ab. CampbeU’s Is lan d ; dredged up in tliree fathoms water.
Two specimens, one with capsidar. tbe other irith grannlai- fruit, we refer to this species. The capsuliferous
specimen bears a vc’ry great resemblance to the north of Ireland vai-iety of N. laeeratim ; the granidiferons, again,
has more the oblong form of N. pmidatum. Both agi'ee in being traversed, especially iu the lower part, with obscure
dichotomous nerves, in having the margin crisped, and exhibiting a tendency to dichotomous division. The scattered
granular fructification essentially distinguishes it from N. laciniattm, and the form and size of the spots, fr-om
N. punctaUm.
P l .y t e LXXI. Fig. I.—1, 2, a n d 3, specimens o f the natural size; 4 , coceidia; 5, sphærospores :—magnified.
2 . N i t o p h y l l u m pmnetatmnX Grev. Alg. B r it. p. 7 9 . t. 1 2 . Agardk, Species Alg. vol. i . p. 1 8 6 .
Aglaopliyllimi, Montagne in P la n t Cell. Canar. p. 1 5 0 .
H ab. CampbeU’s Island ; -ndtb th e former.
Decayed fragments, which appear to belong to tliis species, are all that were prociu-ed.
1 9 . PLOCAMIUM, Lyngb.
Obs. The genera Thamnophora and Flocamium. appear to difier in no respect from each other, and so perfectly
2 P
< l|
ÎJÈ.