OF SOUTH AUSTRALIA. 
275 
Polysiphonia aurata Harvey. 
Harv. Acc. of W. Aus. no. 95; De Toni Syll. Alg. IV., 933. 
Fronds caespitose, 10-20 cm. high, filiform, articulate, irregularly 
branched; branches alternate or dichotomous, erect, patent; ramuli 
alternate or secund, apices furcellate. Ten siphoned. Articulations below 
two-three times as long as broad. Stem seven furrowed. Tetrasporangia 
large, almost solitary. Cystocarps ovate, sessile. Colour red-brown. 
Western Australia (King George Sound). 
The following two species have also been recorded, but very meagre 
descriptions are given, by De Toni. Examination of type or authentic 
specimens is required. They are included here as they are ten siphoned : 
Polysiphonia Argus Kiitzing. 
Kiitz. Tab. Phyc. XIV. (1864), p. 17, t. 48; De toni Syll. Alg. IV., 960. 
Ten siphoned. 
Victoria (Western Port). 
Polysiphonia angustissima Kiitzing. 
Kiitz. Tab. Phyc. XIV. (1864), p. 17, t, 47; De Toni Syll. Alg. IV., 960. 
Fronds ecorticate 10 siphoned, with very short articulations. Similar to 
P. Eoeuna. 
Victoria (Brighton Beach, Port Phillip). 
B. Fronds more or less inarticulate. 
V. — FULIGINOSAE. 
Siphons 12-16 or more. Fronds tall, inarticulate and corticated at the 
base, apices pellucidly articulate. 
Polysiphonia virgata (Ag.) Spreng. 
(Syn. P. fuliginosa Rud.) 
Harv. Nereis Austral., p. 56; Kiitz. Tab. Phyc. XIII.. t. 59; De Toni 
Syll. Alg. IV, p. 952. 
Fronds 30 cm. to 50 cm. tall, terete, becoming slenderer upwards; 
inarticulate, opaque, simple or once or twice forked below, with long virgate, 
quadrifarous branches throughout, these in turn with lateral branchlets 
which are again branched. Articulations, where visible, as long as broad. 
Stem and large branches consisting of a central tube surrounded by a 
broad belt of small irregular cells, in many rows, round which 16 tubes 
radiate in an elliptic curve, again surrounded by another broad belt of 
cells; lesser branches consisting of a central tube surrounded by 16 others, 
and with a very narrow external cellular coat; a ramulus shows only 16 
primary tubes. Tetrasporangia in accessory, dichotomous ramuli in the 
axils of penultimate branchlets. 'Cystocarps globose-urceolate, disposed on 
small adventitious ramuli. Colour dark reddish-brown. Substance carti- 
laginous, soon decomposing in fresh water. 
Australia (doubtful), Cape of Good Hope, Brazil. 
