OF SOUTH AUSTRALIA. 
261 
Subfamily Polysiphonieae (Kutzing) Schmitz and Falkenberg. 
KEY TO THE GENERA. 
a. Lateral ramuli of vegetative branches sometimes 
abbreviated, spiral or irregular. Tetrasporangia 
in upper vegetative ramuli, scarcely altered, 
single in each articulus. 
b. Fronds cartilaginous, four pericentral siphons, 
cortex parenchymatous. Tetrasporangia in a 
single spiral line Lophurella 
Schmitz. 
bb. Fronds filiform, not hair-like, three pericentral 
siphons, no secondary cortex Falkeniergia 
Schmitz. 
bbb. Fronds not carnose- cartilaginous, four to 20 
pericentral siphons, ecorticate or' with a 
rhizoidal or rarely parenchymatous cortex. 
Tetrasporangia in a single line, straight or 
spiral Polysiphonia 
. Greville. 
aa. Branches covered with larger and shorter ramuli 
of diverse form. Pericentral siphons four. 
Ramuli shortly spoon-shaped, incurved, at first 
spiral and later arboriform, distichous; apices 
of branches persistent Chiracanthia 
Falk. 
LOPHURELLA Schmitz. 
Frond cartilaginous, erect, terete, much branched, the lower ramelli often 
secund, distichous, structure parenchymatous. Axis polysiphonous, sur- 
rounded by four central siphons and almost from the apices to the base 
surrounded by a thick cortex of minute cellules; monopodial to the apices, 
with seven transverse cells. Cystocarps globose-ovoid, prolific in young 
ramuli. Tetrasporangia carried in the upper ramuli sparsely, in the lower 
ones very plentifully, singly in the articulations, arranged in a long spiral 
row. Antheridia small cellular bodies,- pedicellate, cylindrical. Colour red, 
drying almost black. 
Lophurella periclada (Sond.) Schmitz. 
= Rhodomela periclados Sond. 
Frond terete, filiform, simple or pinnate, very much branched, with 
ramelli very spreading and subulate; the lower ones shorter, more simple 
and further apart; the upper ones much thicker, simple and on the upper 
side having another set of ramelli. Articulations in young ramelli hardly 
noticeable. Colour dark purple-brown. Substance rigid. 
South Australia (Robe), Victoria (Port Phillip), Tasmania. 
