322 
THE SEAWEEDS 
inflated, with a projecting orifice; the spores are very narrow-pyriform, 
or rather clavate. The colour is a clear red, discharged in fresh water; 
in drying it becomes darker and browner. The substance is membranous 
and juicy, rather quickly decomposing; and in drying the plant adheres 
strongly to paper. 
West Australia (Fremantle). 
Halodictyon robust um Harvey. 
= Hanowia robust a Harvey. 
Network compressed; filaments setaceous, the primary articulations 
ovoid, much contracted at the joints, two-three timfcs longer than broad; 
stichidia ovate-oblong, with beaded margins ; tetrasporangia biseriate. The 
network forms an irregular sponge-like mass, bristling with small hair-like 
ramuli and showing indications of erect branches, which probably (in full* 
grown specimens) become repeatedly forked. The filaments composed of 
oblong oval cells, containing deep-red endo, chrome, surrounded by a wide 
hyaline limbus. The articulations vary in length, but are rarely more than 
thrice their diameter. The stichidia are often in pairs and issue from the 
angles of the network or from a free ramulus; they are bordered with a 
row of inflated, pellucid cells that look like beads and contain dark-red 
tetraspores in a double row. 
South Australia (Eastern Bays), West Australia (Fremantle), Victoria 
(Western Port). 
Halodictyon arachnoideum Harvey. 
= Hanowia aracknoidea Harvey. 
Network compressed, repeatedly forked ; filaments arachnoid, the 
primary articulations cylindrical, six to eight times as long as broad. Net- 
work 2 cm. to 10 cm. long, at first decumbent, spreading vaguely over other 
algae or old shells; afterwards throwing up erect or ascending branches, 
which are at first simple, then forked, and finally repeatedly dichotomous. 
All the axils are remarkably obtuse and the arms of the forks very patent. 
The filaments of which the net is composed are excessively slender; the 
meshes are of unequal size, pentagonal or hexagonal, and emit from the 
angles short, horizontally patent ramuli. These latter usually consist of 
a single cell. The articulations are all cylindrical, not contracted at the 
points, and are filled with rose coloured endochrome. Substance is 
delicately membranous, and the frond closely adheres to paper in drying. 
South Australia (Holdfast Bay, Kangaroo Island), West Australia, 
Tasmania. 
Halodictyon v datum Reinbold. 
Frond simple ( ?) ; filaments loosely netted, anastomosing, the peripheric 
filaments free, long, many times dichotomous, attenuated above. Stichidia 
developed on the peripheric filaments chiefly singly, with a long and short 
pedicel or sessile, ovate, acuminate, carrying a double row of tetrasporangia. 
South Australia (Eastern Bays). 
