80 
THE SEAWEEDS 
HORMOSIRA Endlicher. 
Proud filiform with swollen vesicated intemodes carrying the con- 
ceptacles, grouped necklace-wise on the axis. No leaves. Conceptacles 
dioecious. Oogonia dividing into 4 oospores. 
Fig. 48 . — Hormosira Banksii with parasitic Notheia anomala,. 
Hormosira Banksii (Turn.) Decaisne. 
Attachment a minute disc. Fronds divaricate-dichotomous, from 5 to 
60 or 90 cm. in length, according to whether they grow on reefs exposed 
at low tide or in deeper water. The vesicated internodes vary greatly in 
shape and size, spherical, oblong, ovoid, obconical, occasionally prolonged 
into cylinders 5 to 7.5 cm. long, the centre hollow, the periphery coriaceous 
and filled with scattered conceptacles. Colour olivaceous, black on drying. 
