472 FLOEA ANTARCTICA. \Fuegia, the 



from which it differs remarkably in the thickened margin of the frond not being siuuated, but proliferous ; in the 

 leaves all being petiolate and arising from the margin, and not from lacinise of the frond ; and in the position of the 

 fructification. 



We have, in figuring the nobler species of this and some other genera, endeavoured to commemorate the 

 services rendered to the botany of the Antarctic regions by those officers of the Antarctic Expedition who particularly 

 devoted themselves to increasing the botanical collections. Their names appear to be more properly associated 

 with the Alga, than with any other tribe of plants ; comprising, as these do, the greater part of the vegetation of that 

 element which these gentlemen have adopted for their home, and being natives of the regions they have so success- 

 fully explored. 



Plate CLXXV. Fig 1, apex of frond and sori ; fig. 2, portion of ditto showing the spherospores : — highly 

 magnified. 



18. NITOPHYLLUM, Grev. 



1. Nitophyliajm lividum, Hook. fil. et Harv.; fronde e stipite brevi filiformi cartilagineo late expansa 

 tenerrirna basi vix venosa furcata v. dichotoma margine undulata livido-purpurea, laciniis patentibus oblongis 

 obtusis, soris rninutissimis pimctiforrnibus coccidiisque perplurimis per totam frondem sparsis. Nobis in 

 Lond. Journ. Bot. vol. iv. p. 253. (Tab. CLXXIX.) 



Hab. Falkland Islands ; Berkeley Sound and Port William, not uncommon. 



Stipes cartilagineus, filiformis, \- 1 unc. longus, ad basin frondis evanidus. Frons 4 unc. longa, 6 v. plures lata, 

 in lacinias paucas latiusculas furcatas apice obtusas divaricatas divisa, avenia, nisi ad imam basin, ubi stipes in venas 

 breves evanidas abiit. Substantia tenerrima. Color livide purpureus, ut in Forphyra, sed vix nitens. 



The colour affords a very distinctive character for this species, in which particular it resembles only one of its 

 congeners, the N. G-unnian/un, Harv., of Tasmania. But that plant, is of a much thicker texture and less lubricous. 

 A single imperfect specimen from Cape Horn probably belongs to the N. lividum. Of the mass of radiating spores 

 contained in the capsules of the species, only those at the base of the cavity are fertile. 



Plate CLXXIX. Fig. 1, sori ; fig. 2, capsule ; fig. 3, vertical section of the same ; fig. 4, portion of ditto : — 

 all highly magnified. 



2. Nitothytjjjm fusco-ruZirvm, Hook. fil. et Harv.; stipite filiformi elongato nunc dichotome ramoso 

 nudo, ramis frondiferis, frondibus flabelliformibus lobatis v. longitudirialiter fissis crasso-membranaceis fusco- 

 rubriSj basi cuneatis in stipitem gradatim angustatis tenuiter venosis, margine piano subintegerrimo, apicibus 

 (exemplaribus nostris) laceris, soris minutissimis punctiformibus coccidiisque liumerosissimis per totam 

 frondem sparsis. Nobis in Lond. Journ. Bot. vol. iv. p. 254. 



Hab. Kerguelen's Land ; parasitical on larger sea-weeds in Christmas Harbour. 



Stipes 1-8 unc. longus, simplex v. irregulariter ramosus, ramis in frondes cuneatas elongatas exeuntibus. 

 Frondes 3-5 unc. longae, latitudine variae, ima basi obscure venosa;, irregulariter profunde fissae, laciniis cuneatis 

 linearibusve. Sori minimi, inconspicui. Spharosporce plerumque solitaries, per totam paginam frondis creberrhne 

 sparsse. Coceidia frondibus distinctis numerosa. Substantia firma, basi subcartilaginea. Color luride fusco-ruber. — 

 Stirps N. idvoideo, Hook, similis, sed abunde differt colore, sphserosporis sparsis, stipiteque ramoso elongato. 



Apparently a native of Kerguelen's Land only, where it was found sparingly, adhering to the stems of larger 

 Algoe.. The colour, texture, and branching stem at once distinguish this from its congeners. 



3. Nitophylldm Crozieri, Hook. fil. et Harv.; fronde basi longe cuneata in stipitem angustata lineari- 

 lanceolata v. ovata v. late ovato-lanceolata integerrima v. in lacinias plurimas longitudinaliter fissa enervi 



