OF SOUTH AUSTRALIA. 
273 
Polysiphonia frutex Harvey, 
Lond. Joun Bot. III., 439; Ilarv. Nereis Australis, p. 52; Kiitzing, 
Tab. Phyc. XII., t. 21; De Toni Syll. Alg IV., 925. 
Fronds 5-l(em. high, forming globose bushy tufts, branching in every 
direction fron the immediate base, the branches equalling the stem in 
length, or no istinct stem visible; all excessively branched, the lesser 
branches alteiate, very patent or divaricate, setaceous below, attenuated 
upwards, strait, bi-tripinnate, with distant alternate pinnae; these in 
turn bearing <stant, short, spine-like pinnulae, which are sometimes again 
pinnellate ; al l he apices terminating in colourless byssoid fibres. Articula- 
tions visible >m base to apex, very short. Stem shows seven siphons 
surrounding a mall central siphon ; stem furrowed. Cystoearps lateral on 
upper ramuli numerous, shortly stalked, ovate. Colour dull-grey or 
brownish. A ore slender plant than P. cancellata, more densely tufted, 
with rather lager joints and less comparative difference in diameter 
between each iccessive series, of branches. 
South Austria (Pennington Bay, Kangaroo Island), Victoria, Tasmania. 
Polysiphonia fuscescens' Harvey. 
Lond. Jour Bot. III., 439; Ilarv. Nereis Australis, p. 52; Kutz. Tab. 
Phyc. XIII., 67 ; De Toni Syll. Alg. IV, 925. 
Fronds to 2 cm. high, excessively branched and bushy, but not so shrub- 
like at P. frill o; much divided from near the base into long erect branches 
or stems, gei ally simple, sometimes emitting long branches similar to 
themselves. ranches linear or narrow-lanceolate, closely bipinnate 
throughout t\ r length, the pinnae very short relative to the length of 
the branch, er.it or erecto-patent, pinnulated with short simple spine-like 
ramuli, the apes beset with byssoid fibres. Articulations of the stem and 
branches foiu triate, two-four times longer than broad. Tetrasporangia 
is slightly vencose ramuli. Colour dull-brown or grey. Adheres well to 
paper. Nearl allied to P. frutex, but differing in habit and clearly in the 
length of the rticulations. 
Victoria, T nania. 
Polysiphonia cancellata Harvey. 
Lond. Joui . Bot, III, 440 ; Harv. Nereis Australis, p. 51, tab. XV. ; 
De Toni Syll Alg. IV., 928. 
Fronds 8-1 i m. high, very robust (|-L| mm. thick), excessively branched 
and bushy ; lunches many times alternately divided, the main divisions 
spreading in d directions, forming a globose frond. Secondary branches 
much thinner lan those they spring from, tapering to a fine point; bearing 
ramuli greatl more slender than themselves. Articulate, seven siphoned, 
articulations ry short, marked with four wide colour cells, separated by 
broad pellueh spaces, giving the frond a netted appearance under a lens. 
Tetrasporang; in subsecund stichidia-like ramuli. Cystoearps small, shortly 
pedicellate, o e. Colour brownish, darker when dry. Adheres to paper. 
South Aus ilia (Holdfast Bay, Encounter Bay, Investigator Strait, 
Eastern Bays Western Australia, Tasmania. 
