328 
THE SEAWEEDS 
ones fertile, with an incurved involucre on the furcate ramelli, bearing 
tetrasporangia arranged on the inner side at the lower articulation, 
fasciculate. Adheres to paper. 
West Australia (Eottnest and Garden Islands), Victoria. 
Bornetia Meredithiana J. Agardh. 
Fronds erect, dichotomous, branches alternately abbreviated and hang- 
ing down on the sides in elongate rachides, extremely pinnate; lower at 
length apparently opposite at the nodes of the principal rachides, and 
ramuli decurrent, conjoined at the nodes, laxly stupose; branches and 
ramuli thick, scarcely diverging; articulations five to six times as long as 
broad. 
South Australia (Eastern Bays), Tasmania. 
MONOSPORA Solier. 
Fronds erect, filiform, dichotomously or pinnately branching, articulate, 
monosiphonous, sympodial, below sometimes . corticated with rhizoids. 
Cystocarps on short ramuli, terminal, surrounded by a corona of involucrate 
unicellular ramuli. Gonimoblasts evolved successively from a single or 
numerous rotund gonimolobes. Tetrasporangia on lateral, slender, densely 
decomposite branches, aggregated or single in the axils, sessile or shortly 
pedicellate, round, triangularly divided; in some species nearly always 
undivided, gemma-like. Antheridia ovoid, similarly situated to the tetra- 
sporangia. 
Monospora australis (Harv.) J. Agardh. 
= Corynospora australis Harvey. 
Frond setaceous, gelatinoso-membranaceous, dichotomous-decompound 
and alternately ramuliferous ; branchlets several times forked, the lesser 
ones very slender ; apices much attenuated ; articulations of the branches 
very long, not contracted at the nodes ; tetrasporangia oblong, subsessile. 
Attachment a small disc. Fronds tufted, 4 cm. to 7 cm. high, less than 
i mm. thick at the base, much attentuated upwards, soon becoming capillary, 
and thence attenuated to an excessive fineness, repeatedly dichotomous, the 
upper branches beset with short lateral branchlets. Branchlets 4 mm. to 
8 mm. long, very slender, several times regularly forked, the apices much 
drawn out and slender, subacute. Tetrasporangia formed in the axils of 
most of the upper forks, oblong, scarcely pedicellate/ or subsessile, with an 
undivided dark-red nucleus. Articulations of the larger branches many 
times longer than broad, with a narrow endochrome, cylindrical, not con- 
tracted at the nodes ; those of the upper branches and ramuli similar, but 
much shorter. Colour rosy, becoming darker in drying. Substance very 
soft and gelatinous, soon decomposing. Adheres to paper. 
West Australia (Rottnest Island, Fremantle), Victoria (Port Phillip). 
