OF SOUTH AUSTRALIA. 
175 
uniform throughout the plant, 2 mm. to 5 mm. Substance coriaceous- 
cartilaginous. Colour a clear deep-red, fading to yellow and creamy-white. 
Western Australia and South Australia (Investigator Strait, Eastern 
Bays). 
spores from the nucleus; /, pseudo-tetra- 
spore. (After Harvey.) 
THYSANOCLADIA Endlicher. 
Frond flat, two-edged, distich ously decompound-pinnate, the pinnae 
opposite, composed of three strata; the medullary of densely interwoven 
slender, longitudinal filaments, without an articulated central axis; the 
intermediate of roundish-oblong cells ; the cortical of minute, vertically 
seriated, coloured cellules. Cystocarps semi-immersed, containing within a 
thick pericarp, minute spores arranged in spore-threads radiating from a 
large placenta. Tetrasporangia cruciately divided. 
Thysanocladia Harveyana J. Agardh. 
Frond with terete stipe, above flat and without a midrib, distichously 
decompound-pinnate; pinnae broadly linear, patent, sub-opposite; pinnules 
