Campbell's Islands] FLORA ANTARCTICA. 179 



8. CHORDA, Stackh. 



From tubulosa, filiforuiis, simplex, intus transversim septata, extus fills minutis clavatis horizontalibus omnino 

 velata. Fructus : spora pyriformes filis periphericis immersae. 



1. Choeda lomentaria, Lyngb., Hydr. Ban. p. 74. t. 18. Grev. Alg. Brit. p. 48. Hook. Br. Fl. 

 vol. ii. p. 276. Harv. Br. Alg. p. 35. Wyatt, Alg. Banm. no. 6. Scytosiphon Filum, var. y. Ag. Sp. Alg. 

 vol. i. p. 162. Ag. Syst. p. 257. C. riniosa, Mont.t Prod. Plryc. Antarct. p. 12. Voy. an Pole Sud, Bot. 

 C'rypL p. 44. 



Hab. Lord Auckland's group ; on rocks in the sea. 



Radio; scutata. From (in exemplaribus Aucklandicis) pedalis, 2 lin. lata, basi tenuissima, longe setaceo-fili- 

 formis, sursum seusim latior, apicem versus subattenuata vel acuminata, remote septata, constricta, interdum sub- 

 continua et aequalis. Color sordide badius v. fusco-okvaceus. Superficies tola filis clavatis minutissimis sporis 

 immixtis velata. — Charta? arete adkseret. 



These specimens differ sbghtly from the European form of the species, in having the constrictions less obvious 

 and at much wider intervals. In some individuals scarcely any constriction occurs, and then it is not easy at first 

 sight to distinguish them from a common state of Asperococcus ecliinatus. In others, again, they are evident, and 

 microscopical examination proves that they do not belong to Asperococcus. At the Falkland Islands this plant was 

 also found, and the specimens from that locality are identical with the common European appearance. 



9. ADENOCYSTIS, Hook.Jil. et Harv. 



Radix scutata. From membranacea, saccata, intus cava, aqua repleta, foveis convexis opacis fila arachnoidea 

 emittentibus conspersa, filis minutis clavatis omnino velata. Fructus : spora pyriformes filis periphericis immersae. 



Obs. This genus differs from Asperococcus in having its fructification spread over the entire surface, as in 

 Chorda, and not confined to distinct sori ; and from the latter in being destitute of septa, and in possessing innumer- 

 able pale depressions, composed of radiating filaments with very short coloured joints, emitting from their apices 

 tufts of colourless, long, jointed, byssoid fibres. These appear afterwards to fall away, leaving depressions and often 

 punctures of the membrane in their place. The tufts of arachnoid fibres do not expand well after having been 

 dried, though they may always be found in the damaged state, by carefully scraping away the surface of the frond. 



1. Adenocystis Lessoni, Hook. fil. et Harv.; Asperococcus Lessoni, Bory, in Buperrey Voy. p. 199. 

 t. 11. f. 2. Grev. Syri. p. xlii. Midi. Gen.. Supp. vol. iii. p. 26. (TAB.LXlX.Fig.il.) 



Hab. Lord Auckland's group ; on rocks left by the tide, abundant. 



Radix scutata, exigua. Frondes 1^ unc. longa?, -t lata?, csespitosas, e stipite setaceo-filiforrni 1 lin. longo orta;, 

 ellipticas vel obovatee, infiatae, aqua semper repleta?, obtusissimae, membranacea?, vix reticulata?, cellubs minutissimis 

 constituta?, glandulis superficiariis v. subimmersis convexis dense conspersa?. Glandules hemisphaerica?, e filis minutis 

 l-adiantibus brevissime articulatis atro-fuscis formatae, fibrillas penicillatas longe articulatas hyalinas arachnoideas 

 apice gerentes, demum concava?. Superficies frondis filis coloratis (endochromaticis) minutissime clavatis erectis in 

 strato tenuissimo connexis induta. Sport? obovata?, nigro-fusca?, limbo hyalino cincta?, per totam frondem sparsae, 

 filis periphericis immersae, sessiles. Color fusco-olivaceus, sordidus. Substantia mollis. — Chartae adhaeret. 



Our plant strongly resembles the Fncus saccatus of Turner, {Bumontia saccata), especially specimens from 

 Nootka Sound ; a close microscopic examination being necessary to distinguish them. Possibly the plant, alluded 

 fo by Turner, in his description of F. saccatus, as having been sent to him from New Holland by Mr. Brown, and 



