Iridcea .] 
IX. ALGzE. 
701 
2. I. lanceolata, IT art. in FI. N. Z. ii. 252. Fronds numerous from 
the same base ; stipes 1-2 in. long, cuneate at the base, then linear, gradually 
dilated upwards, pinnated below with spreading linear or lanceolate leaflets ; 
above expanding into the lamina, which is 1-2 ft. long, red-purple, crisped 
aud waved, 1-3 in. broad, lanceolate, tapering at both ends, between horny 
and membranous, rigid when dry. 
Otago, Lyall. 
3. I. lusoria, Harv. in FI. N. Z. ii. 252. Frond stipitate, cartilagi- 
nous, simple, most frequently split ; segments dilated or contracted, very pro- 
liferous, vaguely and inordinately produced. — Rhodymenia, Grew in Hook. 
Comp. Bot. Mag. ii. 329. 
East coast, Cunningham; Otago, Lindsay. (Specimens very imperfect.) — A very doubt- 
ful plant. 
4. I. laminarioid.es, Rory in Voy. Coquille, 105. t. 11./. 1. Fronds 
gregarious, linear-obovate, violet-purple or livid-purple, obovate, narrowed to 
a channelled stipes 1-2 in. long, usually split into erect or spreading linear- 
lanceolate segments, which are produced to a point. — Mont, in Yoy. au Pole 
Sud, 105 ; J. Ag. Sp. Alg. ii. 253. 
Lord Auckland’s group, D’Urville. (N. andS. Pacific Oceans.) 
5. I. volans, Grev.? “Frond simple, flat, obovate-lanceolate, dirty 
violet ; disk and margins covered with short, flattish, linear branchlets, those 
of the margin longer.” — Mont, in Voy. au Pole Sud, 10-1. 
Lord Auckland’s group, D’Urville. — A solitary imperfect specimen is all that 
Montague describes from ; it is perhaps Gigarlina stiriata. 
80. CHONDEFS, Linnmus. 
Frond dull red, cartilaginous, flat or compressed, ribless, flabellately dicho- 
tomously cleft ; structure of three strata, innermost of dense, interlaced, lon- 
gitudinal filaments, next of small roundish cells ; cortical of vertical, coloured, 
moniliform filaments. Conceptacles containing radiating filaments, whose 
lower joints develope into spores, at length opening by a pore. Telraspores 
in sori, immersed in the frond ; there are also cavities in the substance of 
the frond containing minute spores. 
Usually perennial Alga , common in the north temperate zone. 
1. C. tuberculosus, Rook. f. and Harv.; — FI. Antarct. i. 188. Frond 
2 in. long, cartilaginous, thick, livid, simple and broadly cuneate below, then 
linear and forked ; margins simple or proliferous ; segments spreading or 
divaricate, flat or channelled, broader upwards, obtuse ; axils rounded. Con- 
ceptacles very numerous on the concave surface of the frond, globose, de- 
pressed at the tip, at length opening by a pore ; spores minute. — J. Ag. Sp. 
Alg. ii. 248. Notkoyenia, Kuetzing. 
Lord Auckland’s group, J. D. H. 
2. C. variolosus, Montague. — Nothogenia , FI. Antarct. i. 188. Frond 
cartilaginous, compressed, 6-8 in. long, linear, red-purple, at length brown. 
