OF SOUTH AUSTRALIA. 
189 
Gracilaria Harvey ana J. Agardh. 
Fronds 30 cm. long or more, about 2 mm. thick. Substance solid, fleshy- 
cartilaginous. Cystocarps minute, scattered over ' the branches. Colour 
intensely purple. 
Western Australia and South Australia (Holdfast Bay, Eastern Bays). 
TYLOTUS J. Agardh. 
Frond flat, membranaceous-leathery, di-trichotomous, of two strata, the 
medullary of rounded-angular cells, externally smaller, the cortical of 
minute cellules joined in vertical threads. Cystocarps sessile, emerging 
from the face of the frond, in a very thick pericarp, containing minute 
spores arranged in spore-threads issuing from a large fleshy central 
placenta. Tetrasp 9 rangia in oblong nemathecia on the middle of a segment, 
with zonately divided sporangia and parenemata. 
Tylotus obtusatus (Sonder) J. Agardh. 
Frond brownish-red, membranaceo-coriaceous, irregularly dichotomous, 
multipartite; axils and apices rounded. Cystocarps scattered over the 
disc. Tetrasporangia in oval nemathecia, prominent on both surfaces of the 
frond, seriated along the larger segments. Height 10 cm. to 15 cm. 
Western' Australia, South Australia (Eastern Bays), Victoria. 
