699 
Gigartina . ] ix. ALGA5. 
§ 1. Frond terete or compressed ; concept act es submarginal on the more or less acuminate 
pinnules. 
1. G. pistillata, Gmelin ; — FI. N. Z. ii. 252. Fronds several together, 
3-6 in. long, dull purple, horny when dry, compressed, stipitate, flabellately 
branched, J in. diameter; branches forked, naked or pinnate with short 
horizontal subulate ramuli, which bear the conceptacles at or near their tips. 
— Harv. Phyc. Brit. t. 232; J. Ag. Sp. Alg. ii. 264. G. divaricata, FI. 
Antarct. 187 ; J. Ag. 1. c. 280. 
Apparently common on the coast, Colenso, etc. Campbell’s Island, J. D. H. (N. 
Atlantic Ocean.) — A very variable plant in New Zealand. 
2. G. Chapmani, Hoo7c. f. and Haro. FI. N. Z. ii. 251. t. 119 B. 
Frond 2 in. high, dull red, filiform, alternately decompoundly branched, com- 
pressed and channelled when dry ; branches flexuous, variously divided ; 
branchlets scattered, subulate, divaricate. Fructification unknown. 
Maketa, Chapman . — Apparently allied to the British G. acicularis, but much more 
slender. 
3. G. Chauvinii, J. Ag. Sp. Alg. ii. 268 ; — FI. N. Z. ii. 252. Frond 
1 ft. and more long, flat, linear, regularly pinnate, between membranous and 
cartilaginous, dark red or violet, decompoundly pinnate and proliferous from 
the disk ; pinnae distichous, patent, tips elongate, 3-4 in. long, mixed with 
shorter, sterile, ovate-lanceolate ones, fertile with numerous marginal concep- 
tacles. Tetraspores forming a submarginal line. — Spheerococcus , Bory in Voy. 
Coquille, t. 20. CJiondroclonium, Kuetzing. 
Slew Zealand, D’Urville. (Peru, Chili, Puegia.) 
§ 2. Frond thick, flat, subchannelled, pinnately decompound ; conceptacles subsolitary 
on the disks of the pinnae. 
4. G. livida, J. Ag. Sp. Alg. ii. 270; — FI. N. Z. ii. 252. Frond 
purple or livid, a span high, | in. broad, narrowed to a terete stipes below, 
3-pinnate or more ; pinnae and pinnules distichous, linear or oblong-lanceo- 
late, obtuse, fertile ones more obovate. — Fucus, Turn. Hist. t. 254. 
New Zealand, Banks and Solander ; Paroa, Otago, and Jackson’s bays, In/ all, 
Lindsay. (Tasmania.) 
§ 3. Frond, channelled, dichotomous or subpinnate ; conceptacles umbilicate, numerous, 
submarginal on the convex surface of the frond. 
5. G. alveata, J. Ag. Sp. Alg. ii. 271 ; — FI. N. Z. ii. 252. Frond 2-4 
in. long, gregarious, linear, above fastigiately dichotomous, ^ in. broad ; 
segments close-set, uppermost revolute ; axils spreading, subacute. — C/ton- 
drus, Grev. Fucus, Turn. Hist. t. 239. Mastocarpus, Kuetzing. 
Probably common, Banks and Solander, etc. 
6. G. ancistroclada, Montague in Voy. au Foie S/td, 121. t. 7./. 4. 
Root discoid. Frond 2-3 in. high, linear, in. broad, shortly stalked, dark 
red-purple, rigid, channelled on one side, convex on the other, irregularly 2-3- 
pinnate ; pinnse alternate or subopposite, often secund ; tips strongly incurved 
or hooked. — Harv. Phyc. Austr. iv. 197 ; J. Ag. Sp. Alg. ii. 272. 
Akaroa, D’Urville ; Otago, Lyall. (Tasmania.) 
2 z 2 
