IX. ALGyE. 
645 
II. Frond filiform, articulate, of one tube. Articulations naked or coated with small cells. 
Tbibe XI. Spyridieae. Spore-masses in an external , closed, cellular conceptacle, con- 
sisting of many lesser masses, each formed by the evolution of paniculately branched 
spore-threads. Spores at length aggregated without order. 
Frond filiform, pinnately decompound 90. Spyridia. 
Teibf. XII. Ceramieae. Spore-masses single , naked or involucrate (by small branch- 
lets). Spores aggregated without order within a hyaline membranous cell , developed 
externally. 
§ 2. Tetraspores formed of the cortical cells, more or less sunk in the frond. 
Frond coated with roundish, irregularly placed cells 91. Ceramium. 
Frond coated with rectangular cells, in longitudinal series . . . 92. Centroceras. 
§ 2. Tetraspores formed of whole branchlets, or external cells of these, hence external. 
stalked or sessile. 
* Spore-masses involucrate. 
Frond linear, compressed, opaque, pellucid and articulate at the 
tips, pinnate and pectinate 93. Ptilota. 
Frond filiform, pellucid, trichotomous 94. Griffithsia. 
Frond filiform, rigid, pellucid, pinnately decompound and plumose 95. Ballia. 
** Spore-masses' not involucrate. 
Frond articulate, pellucid, or main stems etc. coated with cells . . 96. Callithamnion. 
Suborder III. Chlorospermeas. 
(Green Algae.) 
Plants almost always grass-green, rarely olive-green or purple, still more 
rarely red. Propagation by division of the cells, or by the transformation of 
the cell-contents into spores (called zoospores ), or more rarely by spores de- 
veloped in proper spore-cases. Antheridia containing antherozoids have been 
found in some. — Marine or freshwater plants, or inhabiting damp places. 
Tribe I. Siphoniese. Frond green, rooting or fixed by its base , simple or compound, of 
a single filiform branching cell, or of many such uniting to form a spongy frond . — 
Marine or freshwater. 
Rhizome prostrate, rooting; branches erect, membranous, uni- 
cellular ; cells filled with a network of branching fibrils . . . 97. Caulerpa. 
Frond a matted mass of tubules, full of granular green matter, with- 
out fibrils 98. Codium. 
Frond of tufted filaments, matted below, irregularly branched above 99. Vaucheria. 
Frond of free, tufted or solitary filaments, which are pinnately 
branched 100. Bbyopsis. 
Tribe II. Dasycladese. Frond green, rooting, of simple or branched, inarticulate, 
axial threads, with whorled articulate branchlets. Spores spherical, in proper fruit- 
cells. — Marine, sometimes crusted with lime. — No species has hitherto been sent from 
New Zealand. 
Tribe III. Valoniese. Frond green, rooting , of large bladdery cells, full of coloured 
fluid, often united into filaments or a network. — Marine. — Not yet sent from New 
Zealand. 
Tribe IV. Ulvece. Frond green or purple, fixed by its base, membranous , flat or 
tubular, formed of minute quadrate cells. Fructification, zoospores formed in the cells. 
Frond leaf-like, purple, membranous 101. Porphyra. 
