OF SOUTH AUSTRALIA. 
147 
cells. Cystocarps semi-immersed in the frond, opening by a central pore 
containing parietal tufts of moniliform spore-threads. Tetrasporangia in 
defined sori, under the apices of the segments, zonately divided. 
Acrotylus australis J. Agardh. 
The only species, 6 cm. to 20 cm. high, 2 mm. to 3 mm. wide. The colour 
brown-red. The substance tough and leathery. 
South Australia (Encounter Bay), Victoria, Tasmania. 
HENNEDYA Harvey. 
Frond flat membranous, dichotomo-laciniate. Composed of three strata 
of cells, the medullary of densely interwoven narrow threads, the inter- 
Fig. 21 . — Hennedya crispa: a, plant; b, apex of 
a segment, with conceptacles under 
the tips; c, section through the 
frond, and through a conceptacle; 
d, tuft of spores; e, section through 
a sorus; /, tetraspores from the 
same. (After Harvey.) 
mediate of a simpler series of large-squared cells ; the cortical of shortened 
moniliform vertical chains. Cystocarps show a cavity lined with parietal 
bundles of pregnant cells. Tetrasporangia below the thickened apex of 
laciniae, zonately divided. 
Hennedya crispa Harvey. 
The only species. Height 15 cm. to 30 cm. Colour brownish-purple. 
Western Australia, South Australia (MacDonnell Bay). 
