N, 
ot 
Campbell's Islands. | CRYPTOGAMIA ANTARCTICA. 73 
tibus oblongis cuneatis rariusve elliptico-lanceolatis costa furcata, soris rotundatis maculatis, coccidiis costa- 
libus v. sparsis. (Tas. LXXI. Fig. II.) 
Has. Lord Auckland’s group and Campbell’s Island. (Dr. Lyall.) 
Frons junior, folium obovatum, obtusum v. emarginatum, demum bilobum; costa furcata, demum repetito- 
dichotoma, deorsum crassa, sursum attenuata, sub apicem evanida. Frondes adultee caulis furcatus v: dichotomus, 
2-3 unc. longus, setee porcine crassitie, nudus v. interruptim alatus, superne in frondes cuneatas v. dichotomas 
abeuns; inferne denudatus v. frondibus novis primordiali conformibus sed angustioribus minusque cuneatis ornatus, 
he li unc. longee, costis supra medium furcatis fructiferis. Coccidia in laminam rarius in costam sita, spheerica, 
sparsa, granulis cuneatis repleta. Sori spherosporarum rotundati, supra laminam dispersi. Substantia membranacea. 
Color purpureo-roseus v. sanguineus.—Chartee adheeret. 
When fully grown, this species resembles a very broad and luxuriant state of D. alata, found in the 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, 
which, though gradually evanescent, is obvious for nearly the whole length of the lamina, and thus differs from the 
imperfectly branching veins of the Nitophylla. In old and battered specimens, however, this character can only be 
detected in the young parts; in them, the costa of the first formed leaf becomes denuded, considerably thickened 
and converted into a dichotomous stem, irregularly winged in portions, and only preserving, on the upper part, the 
remains of its former character; while, all along its denuded portions, spring numerous new fronds, narrower than 
that which forms the principal one, and less cuneate, but in other respects similar. 
Pirate LXXI. Fig. IL—1, 2, and 3, specimens in different states, of the natural size; 4 and 5, coccidia ; 
6 and 7, sphaerospores :—magnified. 
18. NITOPHYLLUM, Grev. 
1. NrrorHYLLUM erispatum, Hook. fil. et Harv.; fronde basi nervosa cuneata latissime expansa v. 
oblonga dichotoma v. laciniata margine crispata, nervis ramosis, laciniis cuneatis apicibus axillisque obtusis, 
soris minutis rotundatis coccidiisque sparsis. (Tas. LXXI. Fig. I.) 
Has. Campbell's Island; dredged up in three fathoms water. 
Two specimens, one with capsular, the other with granular fruit, we refer to this species. The capsuliferous 
specimen bears a very great resemblance to the north of Ireland variety of N. laceratum ; the gramuliferous, again, 
has more the oblong form of N. punctatum. Both agree in being traversed, especially in the lower part, with obscure 
dichotomous nerves, in having the margin crisped, and exhibiting a tendency to dichotomous division. The scat- 
tered granular fructification essentially distinguishes it from N. laciniatum, and the form and size of the spots, from 
N, punctatum. 
Prate LXXI. Fig. I.—1, 2, and 3, specimens of the natural size; 4, coccidia ; 5, spheerospores :— magnified. 
2. NIToPHYLLUM punctatum? Grev. Alg. Brit. p. 79. t. 12. Agardh, Species Alg. vol. i. p. 186. 
Aglaophyllum, Montagne in Plant Cell. Canar. p. 150. 
Haz. Campbell’s Island; with the former. 
Decayed fragments, which appear to belong to this species, are all that were procured. 
19. PLOCAMIUM, 7. 
Oss. The genera Thamnophora and Plocamium appear to differ in no respect from each other, and so perfectly 
T 
