Campbell's Islands] FLOE A ANTARCTICA. 183 



Hab. Lord Auckland's group ; on the roots and stems of sea-weeds. 



Caulis 4-8 una longus, setam porcinam diam. asquans, sursum attenuatus, subangulatim flexuosus, vage ramo- 

 sus, nunc subsimplex, ramis lateralibus instructus, nunc e parte inferiore subdichotorne divisus, articulatus, Rami 

 inferiores longiores, superiores sensim abbreviati, simplices v. ramosi, patentes v. divaricati ; ramulis abbreviatis, fla- 

 bellatis, dichotomis, patentissimis, laxe quadrifariam insertis, ultimis subulatis divaricatis v. recurvis. Articuli 

 caulis et ramorum majorum diam. 3-4-plo longiores, 4-5-striati, medio pellucide coccinei v. punicei, ad geniculos 

 cellulis minutis superficialibus donati liinc opaci ; ramulorum diam. vix longiores v. sequales, 2-3-striati. Siphones 

 in ramis majoribus novem, tubulum centralem amplum radiatim cingentes, cellulis externis nullis; caides hinc 

 sulcati. Ceramidia non visa. Stichidia lanceolata, spheerosporas magnas quadripartitas pluriseriatas includentia. 

 Substantia tenera. — Chartse adhaeret. 



Slightly variable in some minor characters, yet a distinctly marked and easily recognized species. Main branches 

 irregular, being imperfectly dichotomous or having a simple stem furnished with lateral branches. The most striking 

 specific character consists in the dichotomously multifid fan-like ramuli, which are set rather laxly along the branches. 

 We have not seen ceramidia ; several of our specimens produce stichidia, of the shape described by Montagne ; but 

 the sphaerospores are in a double and occasionally a triple row, as in Basya. In one individual, the ceramidia are 

 replaced (by disease) with a cluster of sphasrical bodies, forming a mass which resembles the favella of a Callitham- 

 nion, and, from which, fascicles of ramuli are given off in a proliferous manner. These call to mind the capsules of 

 P. botryocarpa, and though their structure be very irregular, they suggest a doubt whether the remarkable fructifi- 

 cation of the latter plant is not abnormal. 



5. Polysiphonia rudis, Hook. fil. et Harv. ; pusilla, fills caespitosis rigidis tenacibus gracilibus subfas- 

 tigiatis ramosis, ramis alternis apicem versus crebrioribus inferioribus filiformibus nudis elongatis superio- 

 ribus basi nudis apice pinnatis, pinnulis subulatis elongatis erectis, articulis ramorum diametro 2-3-plo 

 ramulorum sesqui-longioribus 3-4-striatis. (Tab. LXXIV. Fig. II.) 



Hab. Lord Auckland's group ; parasitic on larger Alga. 



Caides dense csespitosi, e filis intertextis orti, 1-1^ una longi, siccitate rigidi, madore tenaces, atro-fusci, vix 

 rubescentes, indivisi. Rami inferiores erecti, elongati, simplices, filiformes, nudi ; superiores sensim breviores, apices 

 versus breviores, inferne nudi, superne pinnati, pinnis subulatis erectis inferioribus longioribus, hinc ramulis corym- 

 bosis. Circumscriptio ramorum obovata. Articuli per totam plantain manifesti, ramorum diametro 2-3-plo longi- 

 oribus pauci-striatis, ramulorum sesqui-longioribus. 



Plate LXXIV. Fig. II. — I, a specimen of the natural size ; 2, lower portion of branch and stichidia ; 3, upper 

 ditto; 4, a stichidium; 5, sphaerospores : — magnified. 



6. Polysiphonia ceratoclada, Mont. ; filo primario repente, caulibus erectis compressis indivisis demum 

 ramos alternos emittentibus, ramis ramulisque brevibus subulatis patentissimis v. recurvis vestitis, ceramidiis 

 sessilibus ovatis suburceolatisve, articulis brevissimis. P. ceratoclada, Mont. Prodr.Phyc. Ant. p. 6. Toy. 

 au Pole Sud, Pot. Crypt, p. 130. t. 5. f. 2. (Tab. LXXVI. Pig. II.) 



Var. ft secundata; ramis incurvis, ramulis plerumque secundis. 



Hab. Lord Auckland's group ; both varieties generally parasitical on Laurencia pinnatifida. 



Tota raniulis subulatis obsita. Caides e filis repentibus Algas alias infest antibus, erecti, 1-4 una alti, eom- 

 pressi, in exemplaribus minoribus simplices, in majoribus ramis alternis cauli similibus donati. Ceramidia solitaria, 

 ovata, lateralia, sessilia. Stichidia subulata, attenuata, sphaerosporas uniseriatas foventia. Substantia rigidula. 

 Color fusco-ruber. — Chartse laxe adhaeret. 



The habit of this plant is precisely that of a Polyzonia ; Montague's specimens are in a young state, in which 



