252 
THE SEAWEEDS 
filiform, attenuated at base, tapering and acute, spreading or divaricate. 
All parts of the frond are opaque, coated with thick layers of minute cellules. 
Ceramidia ovate, solitary, scattered, on longish pedicels, rarely subsessile, 
opaque and thick-walled. Stichidia shortly lanceolate or spindle-shaped, 
in dense tufts on the sides of the ramuli and lesser branches, containing a 
double row of tetrasporangia. Colour a very dark brownish-purple, becom- 
ing black in drying. Substance tough and rigid. Does not adhere to paper 
well in pressing, unless very young. 
South Australia (Eastern Bays), Western Australia, Victoria, and 
Tasmania. 
MASCIIALOSTROMA Schmitz. 
Frond filiform or compressed, cartilaginous, pinnately or irregularly 
decompound, opaque, coated with small polygonal, irregular cellules, 
axis articulated, polysiphonous. Ramuli alternate subulate, acute, trans- 
versely striate. Cystocarps containing within a membranous pericarp a 
