162 CRYPTOGAMIA ANTARCTICA. ` [Puegia, the 
9. STEREOCLADON, Hook. fil. et Harv. 
Frons solida, olivacea, filiformis, ramosissima, e cellulis endochromate repletis longitudinaliter seriatis formata. 
Sporidia solitaria, sparsa, in frondis peripheria immersa, nigro-olivacea, elliptica.—Genus dubie affinitatis, vie in 
tribu Dietyotearum includendum. 
1. STEREOCLADON Zyallüü. (Tas. CLXXIV.) 
Has. Cape Horn, and the Falkland Islands; thrown up on the beach, rare. 
Frons 5-6 unc. longa, setacea, decomposito-ramosissima, ramificatione valde irregulari. Caulis percurrens v. 
parce divisus, vix dichotome ramosus. Rami alterni, patentes, flexuosi, decompositi ; ramuli omnes patentes, flexuosi 
v. squarrosi, multifidi, apices acuti. Substantia rigidula, chartee laxe adherens. Color olivaceus. Sporidia numero- 
sissima, per frondis partem superiorem dense sparsa, immersa. 
This remarkable plant resembles, to the naked eye, Dictyosiphon feniculaceus ; but its stem and branches are 
solid throughout, and the seeds are immersed endwise, in the substance of the branch. 
Prate CLXXIV. Fig. 1 and 2, portions of branch and ramuli ; fig. 3, segment of ramulus; fig. 4, transverse 
section of fructifying stem :—magnified. 
10. CHORDA, Stackh. 
1. Ononpa /omentaria, Grev., Alg. Brit. p. 50. .9. Fl. Antarct. Pt. 1. p. 179. 
Has. Berkeley Sound, Falkland Islands, and Christmas Harbour, Kerguelen's Land; abundant. 
Very abundant on the shores of Europe, from the Mediterranean Sea to the German Ocean. Also found 
in Lord Auckland's Group, but not, that we are aware, within the Tropics. 
11. ASPEROCOCOUS, Lamourz. 
1. AspErococcus sinuosus, Bory, Morea, p. 826. Encclium sinuosum, 4g. Sp. Aly. vol.i. p. 136. 
Has. Falkland Islands; abundant. Hermite Island, Cape Horn. 
. The distribution of this species is very wide, continuing through the Tropics from the latitude of Spain to the 
Falkland Islands. We have specimens from the collections of Humboldt; also from Vogel, gathered in Tropical 
Africa, and from the Red Sea and Persian Gulf. It neither inhabits Northern Europe nor is found on any shores 
south of the Falklands, 
12. ADENOCYSTIS, Hook. fil. et Harv. 
1. Avenocystis Lessoni, Hook. fil. et Harv., FZ. Antarct. Pt. 1. p. 179. t. 69. f. 9. 
. Has. Hermite Island, Cape Horn; Falkland Islands; Kerguelen’s Land, and Cockburn Island, lat. 
64^ 12 S., long. 57? W.; very abundant. 
Apparently quite an Antarctic species, though much resembling some of the Dumontie figured in Postel and 
Rupprecht's great work on the Alge of the Arctic and Pacific Oceans. 
2. ApzNoovsrIs D Urvillezi, Hook. fil. et Harv. Asperococcus D’Urvillei, Bory in Duperrey Voy. 
Bot. p. 200. t. 11. £. 8. f 
Has. Berkeley Sound, Falkland Islands; with the former. 
We are inclined to regard this as a slender state of the 4. Lessonii, which is exceedingly variable when young. 
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