650 
IX. ALGA5. 
[ Margiuaria . 
A small genus, confined to New Zealand and its islands. 
1. M. Boryana, A. Rich. ; — FI. N. Z. ii. 213. Frond many feet long, 
naked below ; pinnae linear, very long, in. broad, ribless, with hooked 
serratures. Bladders elliptic-obovoid, as large as a hazel-nut, subapiculate. 
Receptacles cylindric, 1 in. long, acuminate, simple or sparingly spinous. — 
Mont, in Yoy. au Pole Sud, t. 2 and 3. f. 2 ; J. Ag. Sp. Alg. i. 250. 
Common on the shores, D' Urville, etc. 
2. M. Urvilleana, A. Rich. ; — FI. N. Z. ii. 213. A smaller plant 
than M. Boryana , but hardly distinct specifically, the pinnae are 1 foot long, 
gradually dilated, simple or flabellately branched on one side. Bladders 
smaller, subspherical, not apiculate.— Mont, in Yoy. au Pole Sud, t. 3. f. 1. 
M. Urvilliana et Giyas, A. Rich. FI. N. Z. t. 3 and 4. Sargassum Lessoni- 
anum and Urvilleanum, A. Rich., Sert. Astrolab. 138. 
Shores of New Zealand, Lesson, etc. Lord Auckland’s group, D’Urville. 
5. PHYLLOSPORA, Agardh. 
Root fibrous. Frond olive-brown, pinnately decompound, with flat ribless 
stem, branches, leaves, bladders, and receptacles which are formed of leaves. 
Bladders marginal, stalked, simple, terminated bv a leaf. Fruit dioecious. 
Conceptacles immersed in small marginal leaves, containing obovoid spores, 
or antheridia. 
A gigantic weed of the Southern Ocean. 
1. P. comosa, Agardh ; — FI. N. Z. ii. 214. Frond solitary, 10-30 ft. 
long. Stem and branches f in. broad, compressed or flat, 2-edged. 
Leaves variable, 4-8 in. long, lanceolate or linear, remotely serrate, inter- 
mixed with spinous processes. — Harvey, Phyc. Austr. iii. t. 153. Macrocystis, 
Agardh, Sp. Alg. i. 253. Fucus, Labill. FI. Nov. Holl. t. 258; Turn. Hist, 
t. 142. 
Common on the shores, Banks and Solander, etc. (Australia.) 
6. SCABERIA, Greville. 
Root discoid. Frond olive-brown, dendroid, irregularly branched, having- 
distinct stem, leaves, bladders, and receptacles which are often undistinguish- 
able from the leaves. Leaves spirally disposed, peltate, warted, fleshy. 
Bladders formed of an inflated leaf. Conceptacles immersed in the trans- 
formed leaves, containing obovoid spores and tufted antheridia. 
The following is the only species. 
1. S. Agardhii, Grev. Frond several feet long, irregularly or alter- 
nately branched. Stem below filiform, flexuous, above covered with crowded 
leaves and bladders. Leaves | in. diameter, fleshy, with short excentric 
petioles, vertically compressed, warted above, smooth below. Bladders large, 
globose, warted. — J. Ag. Sp. Alg. i. 352 ; Harv. Phyc. Austr. iii. t. 164. 
Castraltia Salicornioides, A. Rich. FI. N. Zeal. ii. 143. 
Below low-water mark, common, Lesson, etc. Omitted in the ‘ Flora Novre-Zelandise.’ 
(Australia, Tasmania.) 
