OF SOUTH AUSTRALIA. 
321 
Halodictyon australe Harvey. 
= Hanowia australis Sonder. 
Network cylindrical, repeatedly forked, bristling with excurrent, free 
ramuli; filaments capillary, the primary articulations cylindrical, about 
four times as long as broad ; cystocarps pedicellate, ovate-urceolate, with a 
prominent orifice. 
Fronds originating in a sponge-like amorphous network of anasto- 
mosing filaments ; several from the same base, cylindrical, 4 cm. to 
8 cm. long, 4 mm. to 6 mm. in diameter, subsimple, or once, twice, or thrice 
Fig. 155 . — Halodictyon australe: a, plant; b, portion 
of a branch of the network; c, a mesh, 
a ramulus, and a ceramidium; d, 
spores. (After Harvey.) 
forked. The cylindrical frond is formed of several parallel longitudinal, 
branching filaments, whose branchlets anastomose into the polygonal meshes 
of the tubular network, forming five or six-sided meshes. From the angles 
of these meshes are given off externally short, spreading or horizontal, free, 
once or twice forked ramelli, which spread in all directions and give the 
frond, to the naked eyes, a shaggy aspect. The whole frond is pellucidly 
articulated and composed of monsiphonous filaments; the articulations of 
the meshes are three to four times as long as broad, those of the ramuli 
about the same or shorter. The cystocarps are born on the free ramuli, 
the fertile ramulus being shortened to a single joint; they are somewhat 
