64 CRYPTOGAMIA ANTARCTICA. [Auckland and 
lately been erected into a distinct genus, by Kützing, under the name of Pterocaulon, and on grounds equally valid 
with those which separate some of the above groups. Seirococcus was distinguished from Scytothalia by Dr. 
Greville, by having moniliform instead of oblong or lanceolate receptacles; but the genera have been reunited by 
Montagne, who has added a new species (Scyt. Jacquinotii), and this last approximates so closely to Marginaria, 
as to reduce the clearly appreciable differences between Scytothalia, Mont., and Marginaria, to the former having 
entire and the latter spinuloso-dentate margins,—a circumstance of very minor importance, and perhaps of specific 
value only. Carpophyllum may be distinguished by the position of its vesicles and the clustering of its receptacles 
from Fucus; on the other hand it approaches Sargassum through S. Boryi, Ag. Marginaria contains but two 
species, of which Kiitzing in his late work constitutes as many genera. A. Richard, on the contrary, struck with 
the slight characters on which he had established Marginaria, afterwards combined it with Sargassum. 
The paraphyses, so carefully described by Montagne in the generic character as occuring mixed with the spores, 
answer well to the antheridia observed lately by MM. Decaisne and Thuret in Fucus, whence this.species would be 
regarded by these authors as hermaphrodite. 
1. MARGINARIA Urvilleana, A. Rich.; Montagne Prodr. Phycear. in itin. ad Polum Antarct. p. 10. 
Voy. au Pole Sud, Bot. Crypt. p. 60.t.3.f.1. A. Rich. Fl. Nov. Zel. p.10.t.3. Sargassum Urvilleanum, 
A. Rich. Sert. Astrolab. p. 138. A. Cunn. in Hook. Comp. to Bot. Mag. vol. ii. p. 327. 
Has. Lord Auckland's group; very abundant in shallow water. 
Pime 12-18 unc. longee, 3-1 une. late, coriaceo-membranacez, nigro-fuscee, plane, leves, enerves, argute 
serratee, obtusee, basi sensim attenuate, subpetiolatee, irregulariter dichotome fisse, ramis superioribus plerumque 
simplicibus, inferioribus divisis, sinubus angustis rotundatis, laciniis erecto-patentibus. Vesicule spheerice, 4—8 lin. 
late, muticee, petiolo inconspicuo plano 1 lin. longo suffulte, margine pinnularum superiori affixe. Receptacula 
breviter pedunculata, 2-3 lin. longa, ad basin frondis secus marginem superiorem in serie elongata inserta, divaricata, 
lanceolata, obtusa, compressa, torulosa. Conceptacula globosa, receptaculis immersa, demum plus minusve convexa, 
poro pertusa. Spore exemplaribus nostris immature. 
Dr. Montagne enumerates Blossevillea retorta, Mont., and B. retroflexa, Kütz., as natives of Lord Auckland's 
group, and also the Carpophyllum macrophyllum, Mont. 
2. D'URVILLEA, Bory. 
1. D’Urvırıra utilis, Bory in Duperrey Voy. Bot. Crypt. p. 65. t.1 and 2. f.2. D Urville, Fl. Ins. Mal. 
in Mém. Soc. Linn. Paris, vol. iv. p. 594. Montagne, Crypt. Boliv. et in Voy. au Pole Sud, Bot. Crypt. 
p.23. Decaisne in Archiv. Mus. vol. iv. p. 153. t. 5. f. 1-6. Postels et Ruppr., Illust. Alg. t. 1. Fucus 
antarcticus, Chamisso in Choris, Voy. Pittor. t. 7. 
Has. Lord Auckland’s group and Campbell’s Island, and in the open sea for ten degrees southward 
of these groups. 
The distribution of this species will be considered with that of the genus Macrocystis in the second portion of 
the Flora Antarctica. 
3. XIPHOPHORA, ۰ 
Frons olivacea, linearis, compresso-plana, coriacea, dichotome ramosa. Vesicule nulle. Conceptacula per totam 
frondem sparsa, ramis immersa, tuberculiformia, poro pertusa, intus nature diverse; altera sporas obovatas, nigro- 
fuscas, demum quadripartitas, limbo hyalino cinctas, parietibus affixas, sessiles ; altera fasciculos filorum ramosorum, 
articulatorum, apicibus turgidis et demum in corpuscula granulis repleta (antheridia vel gemmas) mutatos foventia. 
We fully agree with our excellent friend Montagne in the propriety of establishing the present genus, and 
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