nou (suadente clariss. Berkeley), cum Bysso aquatico, D.C., (Geneva Trans, vol. ii. p. 29,), Oscillatoria rubescente, Bory et curn Conferva purpurea quoque conferenda. Fila muscos submersos strato gelatinoso translucente vestientia, dum maxime amplifieata lineis transversis obscure notata.
2. Oscillatoria autumnalis, Agarclh Sgst. p. 62. ; Harvey, Manual of Brit. Alg. p. 165.
Hab. Falkland Islands; on wet rocks; Cockburn Island, Graham's Land (Lat. 64° S. Long. 57°.AV.) in moist places.
We have carefully compared this with Captain Carmichaers Appiu specimens of 0. autumnalis, and find them to be quite the same species, which is considered common in England, though Mr. Hassall quotes Captain Carmichael's habitat as the only one. The figure in the last named author's 'British Fresh-water Algae,' is very unlike either Captain Carmiehael's or the Antarctic specimens ; in both of which the striae are nearer to one another than the filament is broad. The diameter of the Cockburn Island filaments is iS of an inch.
49. CALOTHRIX, Alg.
1. Calothrix olivacea, Hook. fil. et Harv.; caespite majusculo intense olivaceo v. aerugescente erecto strictiusculo, filis basi dichotome v. alterne divisis luteis fiavidisve superne strictiusculis flexuosisve in funiculos crispatos tenaces cohaerentibus per totam longitudinem connexisve apice liberis obtusiusculis, endoclironiate opaco obscure striato, articulis diametro longioribus brevioribusve. Nobis in Lond. Joum. Bot. vol. iv. p. 296. (Tab. CXC. Fig. III.)
Hab. Christinas Harbour, Kerguelen's Land; in alpine rivulets, adhering to stems and leaves of mosses, &c.
Caspites fasciculati, interdmn extensi, i una longi, intense colorati, olivacei hete aerugescentesve, siccitate vix nitentes. Mia C. distorta multoties latiora, flexuosa sed non torta, saepissime in fasciculos siccitate crispatos connexa, circa 20 1 00 unc. lata, basi fiavescentia, ramosa v. divisa. A very pretty species and quite distinct from any European one with which we are acquainted.
Plate CXC. Mg. III. — 1, plant of the natural size ; 2, filaments ; 3, upper, and 4, lower portion of ditto : — much magnified.
2. Calothrix distorta, Harvey, Manual of Brit. Alg. p. 158. Engl. Bot. t. 257.
Hab. Falkland Islands ; in pools of fresh water.
The specimens, though in a very indifferent state, are clearly referable to the English C. distorta.
50. LINGBYA, Ag.
1. Lyngbya muralis, Agardh ; Conferva muralis, Dillwyn, Brit. Conferv. t. vii.
Hab. Falkland Islands ; on the ground, abundant.
These we have carefully compared with original British specimens of L. muralis, and find them to differ only in having the filaments rather broader and more opaque.
2. IiYsgbya fragilis, Hook. fil. et Harv. ; filis minutis tenuissimis fragilibus flavo-viridibus tortuosis implexis in stratum tenue lutescens cohaerentibus, striis densissimis. Nobis in Lond. Joum. Bot. vol. iv. p. 296. (Tab. CXCIII. Fig. II.)
Hab. Berkeley Sound, Falkland Islands ; on the fur of a dead rabbit.
Fila L. murali subsimillima, sed diametro angustiora, fragillimaque. Stratum tenue, lutescens v. flavo-vires- cens, vix nitens.
