704 ix. algas. [. Halymenia . 
Akaroa, D’Urville . — Harvey thinks that this, which is unknown to us, may possibly be 
his Nemastorna Daviesii. 
85. PRIOiNTTIS, J. Agardh. 
Frond dark red, coarse, rigid, dense, compressed or flat, linear, without a 
rib, dichotomous or pinnate, .proliferous on the disk or margin ; structure of 
3 strata; medullary broad, of densely interlaced filaments; intermediate of 
roundish cells ; cortical of minute, coloured, vertically disposed cells. Spore- 
masses simple, imbedded in the substance or marginal processes of the frond, 
opening by a pore, enclosing roundish spores in a gelatinous pellicle. Tetra- 
spores oblong, cruciate, scattered in the cortical layer. 
A small genus, natives of the North and South Pacific. 
1. P. Colensoi, Hoo/c.f. and Harv. FI. N. Z. ii. 254. t. 120 A. Frond 
rigid, dark brown, 6-8 in. long when dry, \ in. broad, irregularly pinnate from 
the base ; branches 3-4 in. long, subopposite, spreading, narrow below, dilated 
beyond the middle, then linear-oblong, obtuse or attenuate ; margins below 
simple, above fimbriate or lacerate, with minute lobes, which are toothed at 
their dilated tips. 
Cape Turnagain, on rocks, Colenso. 
86. GRATELOUPIA, J. Agardh. 
Frond dull purple or greenish, membranous, flexible, solid, pinnate; struc- 
ture of densely woven, anastomosing, branching filaments ; those of the peri- 
phery moniliform, short, densely compacted. Spore-masses globular, im- 
mersed in the periphery, opening by a pore. Tetraspores cruciate, in sub- 
defined sori, vertically placed amongst the peripheric filaments. 
A small northern and southern temperate genus. 
1. G. ? Aucklandica, Mont, in Voy. au Foie Sud, 115. t. 10./. 1; 
FI. Antarct. 187. Frond 4-5 in. long, cartilaginous, filiform, terete, as thick 
as a sparrow-quill, vaguely excessively branched ; branches and branchlets 
crowded and fascicled, subcompressed, narrowed at the base, obtuse, mem- 
branous, sometimes tubular, solitary or several together, springing from a 
curious tubercle on the frond. — J. Ag. Sp. Alg. ii. 185. 
Lord Auckland’s group, D’Urville. 
87. NEMASTOMA, J. Agardh. 
Frond dull red-purple, compressed or flattened, between fleshy and gelati- 
nous, dichotomous or subpinna te ; structure of two strata ; medullary of longi- 
tudinal interwoven filaments ; cortical of radiating, fastigiate, dichotomous, 
moniliform filaments, imbedded in gelatine. Spore-masses immersed in the 
cortical filaments, enclosing roundish spores, imbedded in gelatine. Tetra- 
spores cruciate, scattered amongst the cortical filaments. 
A northern and southern temperate genus. 
