ALGÆ NOVÆ ZELANDLE. 535 
Has. East Coast, Colenso. Bay of Islands, Hooker. 
Fronds + inch to 1 inch in height, setaceous, densely 
matted together in broad tufts, much and irregularly 
branched, rigid, brownish-red, turning black in drying; 
branches very patent, simple or forked, as long as the height 
of the frond, and more or less furnished. with patent spine- 
like ramuli, which issue at right angles and are frequently 
secund.  Teíraspores scattered over the branches, immersed 
in the periphery. Structure : a large central tube surrounded 
by several concentric rows of endochromatic cells or tubes, 
which gradually become smaller outwards.—This species so 
closely approaches in appearance the West Indian Gigartina 
spinella, that it can scarcely be distinguished except by its 
darker colour, until a section of. the stem reveals its different: 
structure. It also strongly resembles Gelid. corneum var. 
crinale, but. may be known at once by its acute ramuli. 
The structure is decidedly that of the family Rhodomelee, 
and not far different from that of R. scorpioides, but the 
fruit, so far as it has been observed, is of a very anoma- 
lous nature. It presents the only instance we know of 
among Rhodomela of scattered tetraspores. 
50. Polyzonia incisa, J. Ag. in Linnea XV. p. 24. 
Has. A common parasite on Gelidium lucidum. 
51. Polyzonia adiantiformis, Dne. in Nouv. Ann. Se. Nat. 
XVII. 363 
Has. New Zealand, (Decaisne) _ 
52. Dasya collabens, nobis; caule fruticoso tereti inarticu- 
lato flaccido glabro alterne ramoso, ramis subdistichis 
erecto-patentibus simplicibus. vel iterum. alterne divisis 
fila articulata rosea monosiphonia dichotomadateralia emit- 
tentibus, filis crassis sensim attenuatis acutissimis bis-terve 
furcatis, articulis diametro duplo vix triplo longioribus ad 
genicula subcontractis. 
Has. Akaroa, M. Raoul. c. 
2—4 inches high. Nearly allied to D. Arbuscula,. from os 
which it differs in being of a much more flaccid, gelatinous - 
nature, closely adhering to paper; and also more esse tially 
