186 
THE SEAWEEDS 
Curdiea Engelhardtii J. Agardh. 
Frond a foot or more high, decompound pinnate, emitting branches, large 
and small distichously from the margin ; rachides and pinnae contracted at 
the base, then flat and linear, coriaceous, prone to divide at the apex. Up 
to 3 cm. in greatest width. Cystocarps on the flat surface, of the Curdiea 
structure. 
South Australia (Lacepede Bay). 
Subfamily Gracilarieae (Naegeli) J. Agardh. 
1. Frond terete or flat. Tetrasporangia cruciately 
divided Gracilaria 
Greville. 
2. Frond flat, Tetrasporangia zonately divided .... Tylotus 
J. Agardh. 
GRACILARIA Greville. 
Frond filiform, cartilaginous, irregularly branched, composed of two 
strata ; the medullary of large, rounded cells, smaller outwards, usually con- 
taining granules; the cortical of minute cellules, vertically seriate, or in a 
single row. Cystocarps hemispherical or conical, sessile on the branches, 
containing within a thick pericarp obovate spores arranged in spore-threads 
issuing from a basal placenta. Tetrasporangia, not in nemathecia, scattered 
among the surface cellules of the branches and ramuli. 
A. — The inner medullary cells conspicuously greater than those next out- 
side to them. Cortical cells sub-monochromatic. 
