Page:The Botany of the Antarctic Voyage.djvu/207

Campbell's Islands] articulatis alternatim ramosissimis, ramis ramulisque patentibus simplicibus elongatis, foliis distichis breve petiolatis trapeziformibus basi cuneatis apice abrupte truncatis, margine inferiore integerrimo superiore inciso-dentato v. lobato, stichicliis spicatis supra-axillaribus lanceolatis dentatis, eeramidiis axillaribus sessilibus solitariis ovatis v. suburceolatis. P. cuneifolia, Mont. Prodr. Phyc. Antarct. p. 4. Toy. an Pole Sud, Pot.

Crypt, p. 143. (Tab. LXXVI.)

Hab. Lord Auckland's group and Campbell's Island ; abundant on the stems of the larger Alga.

Frondes primordiales repentes, caulibus ahjarum radicibus disciformibus seriatim affixse, multistriatse, foliis distichis ornatae. Caules e surcidis repentibus orti, erecti, setacei, 4-5 unc. longi, distiche fohosi, articulati, indivisi; ramis pliuiniis, patentibus, elongatis, simplicibus, distiche alternis vel secimdis ; ramulis conformibus, alternis v. secundis. Folia patentia, disticha, 1. Un. longa, breve petiolata, ssepissime trapezoidea, rarius subrotundata, apice tnmcata, basi late cuneata v. deltoidea; margine inferiore stricto, integerrimo, superiore lacero-dentato, v. 4-5- lobato, lobis serratis. Ceramidia ovato-urceolata, in sinu folii profunde fissi sessilia, sporarum fasciculum pyriforme foventia. Stichidia in spicis supra-axillaribus foliosis (v. bracteatis) ordinata, sessilia, lanceolata, dentata, sphaero- sporarum seriem solitariam iucludentia. Sphrerospora magnae, atro-rubescentes. Color amaene roseus, siccitate vix et ne vix nigricans. Substantia membranacea. — Chartae laxe adhasret.

Most of the numerous specimens of this truly beautiful plant are covered with fructification, chiefly stichidia, the ceramidia being, as is the case with many of the Rhodomelea, much more rarely produced.

Plate LXXVI. Fig. 1, a leaf ; 2, a branch bearing stichidia; 3, a stichidiuni ; 4, a branch with ceramidia; 5, a ceramidium ; 6, spores from the same : — magnified.

14. POLYSLPHONIA, Grev.

1. Polysiphon'ia botryocarpa, Hook. fil. et Harv. ; caule inarticulato valido elongato flexuoso, ramis alterne ramosissimis, ramulis erecto-patentibus alternis secundis sensim attenuatis ultimis subulatis articulatis, articulis multistriatis diametro aequantibus, capsulis minutissimis ovatis in glomerulis parvis pedicellatis densissime congestis, stichidiis seriatim affixis lanceolatis. Rhodom. Gaimardi, Gaud. ? Montague, Voy. an Pole Sud, Bot. Crypt, p. 140. (Tab. LXX.)

Var. a, crassior ; caule alternatim et angulatim flexuoso, ramulis crebrioribus.

Var. ft tenuior ; caule curvato, ramulis elongatis minus divisis.

Hab. Lord Auckland's group ; both varieties abundant on the roots of large Alga, &c.

Radix scutella parva, fibris suppeditata. Caulis 8-14 unc. longus, basi -i Un. diam. sursum attenuatus, cartilagineus, opacus, venis anastomosantibus reticulatus, alternatim flexuosus, nunc genicidatus, nunc curvatus v. alterne arcuatus, subsimplex vel e basi parce divisus. Rami alterni, cauli conformes, inter se circumscriptione late ovati, plus minusve decompositi, alterne v. secunde partiti, non vere dichotomi. Ramuli ultimi alterni v. dichotomi, subulati, erecti v. erecto-patentes, simpbces, articulati, articubs 4-5-striatis, diametro asquantibus. Sipl/ones in ramis majoribus septem principales tubulum centralem angustum radiatim cingentes, cellubs irregidaribus peripheriam versus sensim minoribus circumdati. Color atro-rubescens. Ceramidia miuutissima, ovata, in glomerulis perpusillis subterminabbus laterabbus v. axillaribus aggregata, in quoque glomerulo numerosissima, pecbcebata, sporarum pyriformium fasciculmn includentia. Stichidia ramulis ultimis seriatun affixa, remotiuscula, sphasrosporas majusculas angulatas pluilseriatas includentia : — Chartse laxe adhasret.

This species is of so large a size, such considerable diameter of filament, is so opaque and withal exhibits such sbght external appearance of articulation, that it seems at first sight, to possess considerable affinity with R/todomela, and further bears a strong resemblance to R. subfusea, which it exceeds in size, while agreeing with it in ramification. A careful examination, however, induces us to place it in Polysiphonia, and in the section to which P. fruticulosa