Caulis 4-6 unc. longus, subdichotome divisus, 1-2 lin. latus, compressus, strietus, ramis subquadrifariis distichisve dense obsitus. Rami divaricati, stricti, coinpressi, rugulosi, nudi, parce pinnati v. subbipinnati, apicibus longe nudis. Pinnules horizontals, breves, simplices v. furcatae, lineares, acuta?, nunc abbreviates et spiniformes. Color lividus v. nigro-rubescens, ad apices ramulomm pallidior purpurascens. Substantia cartilagineo-earnosa, ftrma, elastica, siecitate valde contracta. — Chartae non adhaeret.
Our specimens are imperfect and barren, but sufficient to prove them to be a very distinct species of Gigartina. The whole plant is very elastic, shrinking much in drying ; internally it is composed of a dense body of anastomosing filaments, radiating towards the circumference through a firm gelatine.
G.pistillata, Lam., is also enumerated in Montague's account of Lord Auckland's Island.
25. NOTHOGENIA, Mont.
1. Nothogexia variolosa, Mont, in Ann. Sc. Nat. Series 2. vol. xx. p. 302. t. 10. f. 3. Chondrus variolosa, Mont. Prodr. Phyc. Antarct. p. 6. Toy. au Pole Bad, Pot. Crypt, p. 110.
Hab. Lord Auckland's group ; on rocks in tbe sea, abundant. Frondes caespitosae, 4-5-unciales, anguste bneares, 1-1^ Un. lata?, compressse, plana; v. subcanaUculata?, basi cuneatae, superne pluries dichotoma?, laciniis basi angustatis, ultimis elongatis obtusis v. emarginatis -j- 1 unc. longis. Conceptacula per totam laciniarum supremarum, immersa, convexa, vermcaeformia, poro pertusa, utraque frondis pagina sparsa. Substantia cartdaginea. Color fusco-ruber, purpurascens. — Chartae laxe adhaeret.
2G. CHONDRUS, Stach
1. Chondrus tuberculosus, Hook. fil. et Harv. ; fronde cartilaginea basi cuneata late lineari furcata v. ter quaterve dichotoma plana v. canaliculata, laciniis patentibus obtusis, axillis rotundatis, verrucis sphaeroideis pagina frondis superiore extantibus medio depressis demum pertusis massam densam sporarum rosearum includentibus.
Hab. Lord Auckland's group ; on rocks in the sea.
Frons 2-uncialis, basi simplex, superne plus minusve furcata, margine simpbei pinnulisve ornata. Lacinia planae v. pagina superiore canabculata, patentes v. divaricatae, sm'sum latiores, obtusae. Coccidia v. verruca nurnerosissima, magnitudine seminis Brassicae, globosa, latere concavo frondis sita, extantia, rarius pagina frondis immersa, basi constricta, apice depressa v. umbilicata, siecitate apotheciam Lichenis referentia, demum pertusa. Sporce minutae. Substantia crassa, carnoso-cartilaginea, siecitate valde contracta. Color Hvidus. — Chartae laxe adhaeret.
Apparently a distinct species. Smaller than Not h. variolosa, but broader, less frequently dichotomous and with very different fructification. The coccidia? are situated on one side of the frond, prominent, constricted at the base and contain a large dense spherical mass of spondes, similar to those of the differently shaped warts of Chondrus crispus. The shape of the fruit is that of Iridcea Radula or stiriata, and when dried under pressure it resembles the apothecia of a Collenia.
27. IRLTLEA, Pory.
1. Iuidma Pad ul a, Bory, in Paper rey Toy. Pot. Crypt, p. 107. Grev. Alg. Brit. p. 61. Sphaerococcus Radula, Agarih, Sp. Alg. vol. i. 268. Fucus Radula, lib. Panics, Esper, t. 113. Fucus bracteatus, Gmel., Turn. t. 25. Mastocarpus Radula, et Cliondrodictyon Capense, Klitz. Phyc. Gen. p. 396 and 398.
Hab. Lord Auckland's group and Campbell's Island ; very abundant on rocks in the sea.
Radix scutata, fibris comitata. Caulis 1-2 unc. longus, basi cylindraceus, crassitie pennae corvinae, mox compressus, superne dilatatus, divisus v. ramosus. Frondes basi rotundatae, cuneatae v. attenuatae, eUipticae lanceolatseve,
