Chorda .] 
IX. ALGA’. 
659 
A northern genus, rare in the Southern Ocean. 
1. C. lomentaria, Lyngbye ; — FI. N. Z. ii. 218. Frond 1 foot and 
more long, membranous, almost cylindric, often as thick as the little finger, 
constricted here and there. — Scytosiphon, J. Ag. Sp. Alg. i. 126. 
East coast, Colenso ; Waitemata harbour, Lyall ; Lord Auckland’s group, J. D. H. 
(Tasmania, Falkland Islands, N. Atlantic and Pacific Oceans.) 
25. ADENOCASTIS, Hook. f. and Harv. 
Root a small disk or shield. Frond a dull green or olive-brown, mem- 
branous pyriform sac, on a slender short stalk, hollow or full of water, coated 
with a thin layer of vertical clavate articulate filaments. Spores pedicelled, 
pyriform, attached to the base of the filaments and scattered over the whole 
frond. 
The following is the only species. 
1. A. Lessonii, Hook. f. and Harv. FI. N. Z. ii. 218. Frond 1-3 
in. high, coriaceous or of a firm membranous texture ; colour dark brown when 
dry and not adhering to paper. — J. Ag. Sp. Alg. i. 124 ; FI. Antarct. t. 69. 
f. 2 ; Harv. Ner. Austr. i. t. 48. Asperococcus, Bory in Voy. Coquil. t. 11. 
f. 2. 
Common ou tidal rocks from the Bay of Islands to Lord Auckland’s group and 
Campbell’s Island, J. D. R. (Fuegia, Kerguelen’s Land, Tasmania.) 
26. SCYTOTHAMNUS, Hook. f. and Harv. 
Frond blackish-olive, cylindric, branched, fibrous, nearly solid ; axis of 
densely interwoven filaments, which radiate outwards and form a dense cor- 
tical substance of minute coloured cells immersed in gelatine. Spores ob- 
long, immersed amongst the cortical cells. 
The only species is the following. 
1. S. australis. Hook. f. and Harv. FI. N. Z. ii. 219. Frond 2-12 
in. long, very variable, simple or excessively branched. Stem simple, at the 
base as thick as a crow quill, terete ; branches more slender, acute, firm, rather 
rigid, ultimate acuminate. — J. Ag. Sp. Alg. i. 64. 
Common on tidal rocks, J. I). H., etc. 
27. CHORD ARIA, Agardh. 
Root discoid. Frond olive-green, filiform, much branched, cartilaginous ; 
axis of densely-packed longitudinal interlaced cylindrical filaments ; periphery 
of simple clavate horizontal whorled filaments, and long byssoid gelatinous 
fibres. Spores obovoid, scattered amongst the filaments of the periphery. 
Medium-sized Alga, natives of both temperate zones. 
1. C. sordida, Bory ; — FI. N. Z. ii. 219. Frond 1-2 ft. long, flaccid j 
stem short, soon divided, or long and laterally branched ; branches long, 
simple or with horizontal branchlets ; young frond densely clothed with 
