ALGÆ NOVZ .ZELANDIÆ. 531 
long. Ramuli densely pinnated with long, simple or forked, 
fastigiate, erect pinnule resembling those of S. scoparia. 
42. Sphacelaria funicularis, Montag. Voy. au Pole Sud. t. 14. 
J. 1. Hook. fil. et Harv. in Fl. Antarct. p. 180. 
Has. Akaroa, Hombron. East Coast, Colenso (218.) 
43. Ectocarpus siliculosus, Lyngb. 
Has. Bay of Islands, Hooker. 
CHORDARIEX. 
SCYTOTHAMNUS, Nov. Gen. 
Frons fruticosa, compressa v. cylindracea, vage ramosissima, 
cartilagineo-coriacea, e filis crassis longitudinalibus maxime 
intricatis flexuosis difformibus coloratis juxta peripheriam 
. in fila radiantia horizontalia moniliformia dichotoma abeun- 
tibus formata. Ufriculi oblongi, inter fila periphericalia ni- 
dulantes, apicales. 
44. Scytothamnus australis, nobis. Chordaria australis, Ag! 
in Linnea XV. p. A7. 
Has. On rocks in the Bay of Islands, very abundant. 
Root an expanded disk. Fronds tufted, 4-10 inches long, 
excessively branched and bushy, with the habit and substance 
of a Cystoseira, but a totally different structure, solid or 
hollow according to age; the lower part of the stem often 
almost woody, compressed or terete, coriaceous, opake. 
Under a lens the structure is very beautiful; the axis con- 
sists of longitudinal long-jointed anastomosing filaments 
coloured with a brown endochrome, closely packed together 
and somewhat parallel; the periphery of dichotomous moni- 
liform horizontal filaments radiating from the outer ones of 
the axis, their joints containing a dark brown mass, and 
about equal in length and breadth. "There is no prolonga- 
tion of the seen. beyond the surface of the frond, as in — : 
Mesogloia and Chordaria, but the threads of the periphery | 2 E 
end abruptly in the epidermis, andare as closely gig, jo 
. ther as those of a Gigartina.—A very curious plant, whi 
We have ascertained by an interchange of. ipecim ins to. 
