OF SOUTH AUSTRALIA. 
293 
Herposiphonia versicolor (Hook. /. and Harv.) Falkenberg. 
=Polysiphonia\ versicolor Hooker /. and Harvey. 
Fronds densely tufted, rising from creeping filaments, erect, 5 cm. to 
10 cm. high, setaceous below, very fine above, much branched. Stem sub- 
simple, furnished throughout with decompound, lateral, nearly horizontal,' 
subdistichous branches. Eamuli subulate, simple, alternate or frequently 
secund, 4 mm. to 6 mm. long. Articulations one and a half times as long as 
broad, containing about ten tubes surrounding a central cavity. Colour a 
fine crimson, quickly changing in fresh water to golden-orange. Cystocarps 
ovate, sessile near the apex of the ramuli. 
South Australia (Investigator Strait, Eastern Bays), Western Australia 
to Tasmania. 
Fig. 138 . — Herposiphonia versicolor. Fig. 139 . — Protokutzingia australasica. 
Herposiphonia pror opens (Harv.) Schmitz. 
= Polysiphonia prove pens Harvey. 
Frond from ^ cm. to 3 cm. or more long, lying flat on the surface of the 
coralline to which it is attached at intervals by little discs which issue from 
the under surface; vaguely branched, jointed throughout, compressed 
laterally. From the upper side of nearly every joint springs a perfectly 
simple, falcate ramulus, about 2 mm. in length, acute, constricted at the 
base, jointed, and strongly compressed. Joints of the creeping filaments 
rather shorter than their breadth, of the ramuli twice or three times as 
short, all about 12 tubed. Tetrasporangia immersed in the slightly distorted 
ramuli, in a single row. 
South Australia (Holdfast Bay), West Australia (King George Sound), 
South Africa. 
