•] 



PLOBA OF NEW ZEALAND. 



227 



Hab. Parasitical on Amphiroa corymbosa, Colenso. 



Though our specimens are in a very young state, consisting merely of creeping surculi, such as are found in all 

 the species when immature, we are unwilling to omit this little plant, whose leaves are remarkably different from 

 those of any previously-described species. — Plate CXII. B. Eg. 1, plant, parasitic on Amphiroa corymbosa ; 2, 

 portion of stem with leaves of the parasite ; 3, cellular structure of the leaf of the same, both highly magnified. 



4. Polyzonia bipartita, Hook. fil. et Harv. ; surculo trisiphonio repente radicante caules erectos (de- 

 mum ramosos ?) distiche foliatos emittente, foliis alternis fere ad basin bipartitis, laciniis applanatis lineari- 

 bus mucronatis, inferiore horizontali, superiore erecta, e cellulis triseriatis connatis, quarum medise sunt an- 

 gustiores oblongse laterales fere quadratse, sticlridiis axillaribus lineari-oblongis apiculatis. (Tab. CXII. A.) 



Hab. Parasitical on Carpophyllwm, Maschalocarpus, Colenso. 



Our specimens are not fully grown, but evidently belong to a very distinct species, to the naked eye strongly 

 resembling Polysiphonia ceratoclada, Mont., for which it may easily be overlooked. Under the microscope, however, 

 no two plants can be more different. The leaves in our plant are divided nearly to the base into two linear, obtuse 

 or mucronulate lobes, the lower of which is shorter, and spreads horizontally, the upper elongated and erect, each 

 composed of three rows of rectangular cellules, those of the middle row (or midrib ?) about twice as long as broad, 

 those of the side rows nearly square. Slichidia of large size, containing a few large tetraspores in a single row. — 

 Plate CXII. A. Pig. 1, plant, growing on a fragment of Carpophyllwm Maschalocarpus, natural size; 2, part of 

 branch, with bipartite leaves and stichidia, highly magnified. 



5. Polyzonia Harveyana, Dene, in Baoul, PI. Nov. Zel. p. 32. Harv. Ner. Austr. p. 72. 

 Var. /3. Colensoi ; omnibus partibus gracilior. 



Hab. Parasitical on various Alga, very common. 



We are indebted to Mr. Colenso for a very large suite of specimens, a comparison of which proves that P. 

 Harveyana and P. Colensoi, of Ner. Austr., cannot be kept specifically distinct. 



Gen. XL. POLYSIPHONIA, Grev. 



(Grev. PL Edin. p. 308. Harv. Man. ed. 1, 84. J. Ag. Alg. Medit. p. 119. Harv. Ner. Austr. p. 37. Kiitz. 



Sp. Alg. p. 802, etc.) 



Subgenus 1. OLIGOSIPHONIA, J". Ag. 



1. Polysiphonia abscissa, Hook. ill. et Harv.; dense csespitosa vel implicata, capillaris, purpurascens 

 vel coccinea, fronde alternatim decomposita tenaci ilaccida, ramis minoribus basi longe nudis apice alterne 

 ramulosis, ramulis patentibus fastigiatis (quasi abscissis), apicibus nudis vel fibrilliferis, articulis ramorum 

 diametro multiplo ramulorum subduplo triplove longioribus bistriatis, siphonibus quatuor, ceramidiis glo- 

 boso-ovatis pedicellatis saepe seeundis, tetrasporis parvis in ramulos distortos nidulantibus. — P. abscissa et 

 P. microcarpa, M. Ant. v. I. p. 479, 480. t. 182./. 3. Harv. Ner. Austr. pp. 42, 43. 



Hab. Akaroa, Raoul, Lyall. Blind Bay, Cook's Straits, and Paterson's Harbour, Southern Island, 

 Lyall. (Native of Cape Horn.) 



Fronds 3-6 inches high, capillary, densely tufted, of a more or less brilliant purple-red or blood-red, alternately 

 much branched. Principal branches set with shorter ones, which are naked at the base, and multifid at the top. 



On re-examining P. microcarpa and P. abscissa, of the ' Plora Antarctica,' we fear they are not sufficiently dis- 

 tinct. Some of our present specimens are referable to one form, and some to the other. In general habit this 

 species much resembles P. formosa of the northern hemisphere, but differs in the shape of the ceramidia, etc. 



2. Polysiphonia striclissima, Hook. fil. et Harv.; dense csespitosa, atro-rubescens, flaccida, fronde elon- 

 gata basi setacea sursum sensim attenuata capillari dichotome ramosissima, axillis inferioribus patentibus 



