OF SOUTH AUSTRALIA. 
271 
Polysiphonia spinuligera Zanardini. 
Zanard. Phyc. Austral. Nov. (1874), p. 490, n. 12; De Toni Syll. Alg. 
IV., 955. 
Fronds ecorticate from the base, almost setaceous, irregularly dicho- 
tomous-fastigiate, covered with interspersed spiniform ramuli. Tetra- 
siphonous, articulations as long or slightly longer than broad; lower remark- 
ably nodose. Colour dark-red. Substance rigid. 
Tasmania ( Georgetown ) . 
Polysiphonia macrarthra Zanardini. 
Zanard. Phyc. Austral. Nov. (1874), p. 490, n. 13; De Toni Syll Alg 
IV., 955. 
Fronds totally ecorticate setaceous, much branched irregularly, branches 
and ramuli alternate, ultimate ones in lateral congested fascicles. Tetra- 
siphonous, very pellucid, primary articulations 20 times as long as broad, 
ultimately as long as broad. Tetrasporangia occupying the upper ramuli, 
sparsely produced. 
Tasmania (Georgetown). 
Polysiphonia gelidii Zanardini. 
Zanard. Phyc. Austral. Nov. (1874), p. 490, n. 14; De Toni Syll. Alg. 
IV., 955. 
Fronds small, very slender, subdichotomously branched; ultimate ramuli 
lateral, subulate, attenuate. Tetrasiphonous, primary articulations 2-6 
times as long as broad, secondary about as long as broad. Cystocarps 
spherical, sessile on the branches. 
Lord Howe Island (on fronds of Gelidiaceae) . 
Polysiphonia zostericola Lucas. 
Proc. Linn. Soc. N.S.W., XLIV., p. 177. 
Fronds gregarious, forming a thick fringe to Zostera leaves ; not intricate, 
slender, to 2.5 cm. long. Fronds attached by a small basal disc, branching 
below dichotomous, above more pinnate; branches emitted at an angle of 
45°, giving off, at rather long intervals, other like but gradually slenderer 
branchlets, the last very slender and sometimes secund. Main axis 180 /a 
thick; basal articuli 1 x 1, of ramuli 2 x 1, of tetrasporangiferous ramelli 
lxl. Tetrasiphonous. Tetrasporangia small, in little distorted ramelli. 
Cystocarps nearly sessile, ovate, 326 /a x 258 /a, contracted at base. Sub- 
stance rather firm, standing prolonged immersion in water. Colour 
brownish-purple, darker on drying. Adheres closely to paper. 
Botany and Middle Harbour, N.S.W. Abundant on Zostera leaves in 
salt and brackish water. 
Polysiphonia Baxteri Lucas. 
Proc. Linn. Soc. N.S.W. LX., p. 224. 
Fronds growing as a fringe on the fruiting stem of Gracilaria. Branches 
150 fx thick at base, diminishing upwards. Joints 2x1 below, ultimately 
