ALGÆ NOVÆ ZELANDLE. 529 
39 sitisve, ramis erectis, apicibus sepissime tridentatis, re- 
ceptaculis conicis. 
Has. Bay of Islands, R. Cunningham, Sinclair, Lyall, Hooker. 
Root conical, densely clothed with stupose fibres. Frond 
8-10 inches long, from 4 to 3, or sometimes nearly 4 an inch 
in width, distichously branched from the base, the lower 
branches generally opposite as are also several of the upper 
ones, the latter more or less unilaterally dichotomous and 
thus alternate, all issuing at a small angle, membranaceous, 
translucent and thin, in age becoming more opake and sub- 
coriaceous, destitute of evident pores, every where furnished 
with a percurrent nerve, which is medial through the 
branches, but as it approaches the axille deviates towards 
the upper margin of the lamina. Apices of the branches 
entire, or very generally three-toothed. Colour when young 
a fine olive, becoming foxy brown in age. Substance tough, 
but soft, very like that of Dictyota dichotoma. Receptacles 
at the apex of the nerve of the frond, generally terminating 
the middle tooth of the three, but sometimes produced by all 
the teeth, conical, rather acute, fleshy, not quite a line in 
length, composed of branching filaments radiating round a 
columnar axis, and bearing spores and antheridia on the same 
filament; the antheridia oblately elliptical, terminating the 
threads, containing coloured matter, and having the three 
joints immediately below them slightly swollen and coloured; 
the spores linear-oblong, seated on short side branches at the 
lower part of the filaments, filled with dense olivaceous 
endochrome.—In habit this plant very strongly resembles 
Halyseris polypodioides, but its structure is dissimilar, and 
the fruit altogether different. In the fruit it entirely 
agrees with Sporochnus Cabrere, Ag., a plant which Kützing 
has, with great propriety, made the type of his genus Car- 
pomitra. 
DicrvomTEx. 
36. Zonaria flava, Ag. Z. Tournefortii, Monte + =: 
Has. Bay of Islands, Lyall. Hooker. > = = 
