396 
THE SEAWEEDS 
CHEILOSPORUM Areschoug. 
Frond piano-compressed, calcareous, articulated, dichotomous; articula- 
tions obsagittate or obcordate. Conceptacles ovoid, immersed in the upper 
margin of the lobes of the articulations, one in each lobe, furnished with 
an apical pore and containing in the base of the cavity a tuft of erect, 
four parted spore-threads. 
Cheilosporum sagittatum (Lamour.) Areschoug. 
Attachment a spreading calcareous disc. Frond robust, stipitate, becom- 
ing broader upwards, densely tufted, 5 cm. to 15 cm. high, regularly dicho- 
tomous above the middle, flabellifo:m tod fastigiat.e. Lower articulations 
apex of a branch, with ramuli; c, 
fertile articulations, with ceramidia; 
d, a fertile lobe, with its ceramidium, 
after the lime has been removed by 
acid. (After Harvey.) 
obconical, with short oppressed lateral lobes ; middle and upper ones deeply 
sagittate, compressed, tapering at the base, broadly subulate, acute. Ter- 
minal articulation of the branches and ramuli obovate. Fruit as above. 
When the lime is removed by acid, the articulations are elegantly banded 
by alternate bands of roundish and linear cells. Colour when growing deep 
purple-red. Substance rigid and fragile. Does not adhere to paper. 
South Australia (Encounter Bay, Port Noarlunga), New South Wales 
(Kiama), Mauritius, South Africa. 
