76 CRYPTOGAMIA ANTARCTICA. 
Caulis 4-6 unc. longus, subdichotome divisus, 1-2 lin. latus, compressus, strictus, ramis subquadrifariis distichisve 
dense obsitus. Rami divaricati, stricti, compressi, rugulosi, nudi, parce pinnati v. subbipinnati, apicibus longe nudis. 
Pinnule horizontales, breves, simplices v. furcatze, lineares, acute, nunc abbreviate et spiniformes. Color lividus v. 
nigro-rubescens, ad apices ramulorum pallidior purpurascens. Substantia cartilagineo-carnosa, firma, elastica, siccitate 
valde contracta.—Chartee non adheret. 
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 Montagne’s account of Lord Auckland’s Island. 
25. NOTHOGENIA, Mont. 
1. Nornocenta variolosa, Mont. in Ann. Se. Nat. Series 2. vol. xx. p. 302. t. 10. f. 3. Chondrus vario- 
losus, Mont. Prodr. Phyc. Antarct. p. 6. Foy. uu Pole Sud, Bot. Crypt. p. 110. 
Has. Lord Auckland's group; on rocks in tbe sea, abundant. 
Frondes ceespitose, 4—5-unciales, anguste lineares, 1-14 lin. late, compresse, plane v. subcanaliculate, basi 
cuneate, superne pluries dichotome, laciniis basi angustatis, ultimis elongatis obtusis v. emarginatis 4-1 unc. longis. 
Conceptacula per totam laciniarum supremarum, immersa, convexa, verruceeformia, poro pertusa, utraque frondis 
pagina sparsa. Substantia cartilaginea. Color fusco-ruber, purpurascens.—Chartee laxe adheeret. 
26. CHONDRUS, Stack. 
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 sphe- 
roideis pagina frondis superiore extantibus medio depressis demum pertusis massam densam sporarum rose- 
arum includentibus. 
Has. Lord Auckland's group ; on rocks in the sea. 
Frons 2-uncialis, basi simplex, superne plus minusve furcata, margine simplici pinnulisve ornata. Lacinie 
plane v. pagina superiore canaliculata, patentes v. divaricatee, sursum latiores, obtuse. Coccidia v. verruce nume- 
rosissima, magnitudine seminis Brassicee, globosa, latere concavo frondis sita, extantia, rarius pagina frondis immersa, 
basi constricta, apice depressa v. umbilicata, siccitate apotheciam Zichenis referentia, demum pertusa. Spore mi- 
nutze. Substantia crassa, carnoso-cartilaginea, siccitate valde contracta. Color lividus.—Charte laxe adheeret. 
Apparently a distinct species. Smaller than Noth. 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 sporules, similar to those of the differently shaped warts of Chondrus 
crispus. The shape of the fruit is that of Iridea Radula or stiriata, and when dried under pressure it resembles the 
apothecia of a Collema. 
27. IRIDAA, Bory. 
1. Imza Radula, Bory, in Duperrey Voy. Bot. Crypt. p. 107. Grev. Alg. Brit. p. 61. Spheerococcus 
Radula, Agardh, Sp. Alg. vol. i. 268. Fucus Radula, Hb. Banks, Esper, t. 113. Fucus bracteatus, Gmel., 
Turn. t. 25. Mastocarpus Radula, et Chondrodictyon Capense, Kite. Phyc. Gen. p. 396 and 398. 
Has. 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 penne corvine, mox com- 
pressus, superne dilatatus, divisus v. ramosus. rondes basi rotundatze, cuneate v. attenuate, ellipticee lanceolateye, 
[Auckland and 
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