ALGÆ NOVÆ ZELANDLE. 537 
of the frond, very short, composed of beautifully hexagonal 
oblong cells, about 6 in the breadth of the joint, and in- 
ternally formed of about twelve large tubes, each containing 
a separable sac of endochrome, surrounding a small central 
empty tube. Colour when dry very black, and substance 
rigid. 
. 55. Polysiphonia rytiphieoides, nobis; nigro-fusca, caule 
crasso fruticoso virgato tereti sulcato brevissime articulato 
e basi ramosissimo, ramis virgatis erectis decompositis, 
ramulis lateralibus quadrifariis erecto-patentibus sensim 
attenuatis ultimis subulatis sparsis apice fibrillosis, arti- 
culis ramorum 7-siphoniis diametro quadruplo brevio- 
ribus. 
Has. New Zealand, Raoul. 
_ Frond 4-6 inches high, coarse, dark wane. bushy. Joints 
of the stem and branches pellucid, but exceedingly short, so 
that the frond may be said to be closely transversely striate, 
rather than jointed. This species is nearly allied to P. can- 
cellata of Tasmania, but has a different habit and shorter 
joints. 
56. *Polysiphonia bofryocarpa, nobis, in Fl. Antarct. t. 70. 
Rhodomela Gaimardi ? Mont. (not of Agardh.) 
Has. Akaroa, Hombron. 
57. Polysiphonia nigrescens, Ag. 
Has. New Zealand, Raoul. | 
M. Raoul’s specimens are small, but they have all the 
essential characters of this variable species. ee 
58. Polysiphonia Cladostephus,* Mont! Voy. Pole Sud. 
* Since this was prepared for press, Mr. Harvey has received from M. 
Montagne, to whom he communicated a specimen of his P. byssoclados, 
some fragments of the P. Cladostephus of that author, accompanied by the 
following note: “ Admirez la ressemblance de deux choses que je crois 
pourtant différentes! Le fait est qu'en lisant votre diagnose, je présumai 
sur le champ que votre P. byssoclados était identique à mon P. Cladostephus. — 
Maintenant, que j'ai vu la plante, je reste dans le doute. Il est vrai que — ; 
. mes exemplaires sont ceux d’une algue agée. Toutefois en les c E 
. de point en point, on trouve daa ioe ME marquée — la con- C 
VOL. IV. 
