OF SOUTH AUSTRALIA. 
365 
Bracebridgea australis J. Agardh. 
The only species, with the characters of the genus. 
South Australia (Encounter Bay). 
HALIACANTHA J. Agardh. 
Frond terete, irregularly branched, the young ramuli articulate and 
monosiphonous, very soon becoming caulescent, covered more or less thickly 
with articulate, decurrent filaments uniting into an outer tube; the terminal 
ones penicillate, very soft, and the lower ramelli rigid, divaricate and finally 
anastomosing ; the fertile part apparently glabrous. Cystocarps laterally 
rising from the transformed glabrous ramelli, the terminal fascicles covered 
with pyriform carpospores, prominent and scattered everywhere ; the 
encasing ramelli soft, elongate, involucrate. Tetrasporangia carried on the 
monosiphonous ramelli, externally, mostly singly, triangularly divided. 
Haliacantha incrustans J. Agardh. 
The only species, with the characters of the genus. It has the habit and 
size of a Spyridia. 
Southern Australia. 
Subfamily Ceramieae (Dumort) Schmitz. 
CERAMIUM Wiggers. 
Frond erect, filiform, dichotomous or p innately branched, articulate, 
monosiphonous, with a definite layer of cells at the nodes, or the interstices 
corticate with the cells at the nodes placed irregularly. Cystocarps sessile 
on the ramelli, which are involucrate, carrying many angular carpospores 
in a hyaline sack. Tetrasporangia formed from the changed cortical cells, 
prominent, more or less outside the cortex, spherical, triangularly divided. 
Antheridia on the surface of the ramelli formed of minute hyaline cells. 
Ceramium macilentum J. Agardh. 
Frond dwarf, scarcely 5 cm. long, filaments very slender, irregularly 
patently branched, caespitose; articulations of the ramuli short at the 
apices, slightly longer in the glabrous zone, the lower ones very long; the 
nodes are very narrow, consisting of a few rotund cells, glabrous, succulent. 
Tetrasporangia subsecund on the outer side of the ramelli, formed within 
the groups of lateral cells, and above on the glabrous part, prominent and 
almost solitary. 
Victoria (Port Phillip). 
Ceramium repens Harvey. 
Frond dwarf, primary filaments prostrate, creeping from the attachment ; 
ramelli erect and free; secondary ramelli simple, articulations almost three 
times as long as wide; interstices glabrous. Tetrasporangia singly at the 
nodes, unilateral, prominent. 
Victoria (Port Phillip). 
Ceramium ramulosum Hooker /. and Harvey. 
Frond filiform, dichotomous, patently subbranched at almost every node ; 
the terminal segments acute, lower articulations longer than wide, inter- 
stices somewhat coloured and glabrous. Tetrasporangia secund on the 
