190 
THE SEAWEEDS 
Subfamily Hypneae (J. Agardh) Harvey. 
HYPNEA Lamouroux. 
Frond terete, irregularly much branched, composed of three strata, the 
medullary of a few slender longitudinal filaments; the intermediate of 
oblong, angular, hyaline cells ; the cortical of one or more layers of minute 
coloured cellules. Cystocarps hemispherical, containing within a thickish 
pericarp several clusters of pedicellate spores, affixed to slender 
anastomosing filaments. Tetrasporangia lodged in swollen branches, 
zonately divided. 
A. — The older ramuli constricted at the base. 
Hypnea musciformis (Wulf) Lamouroux. 
Caespitose, virgately branched, branches filiform, thickened often below 
the apex and circinately incurved, the ramuli patent divaricate, attenuated 
at both extremities. To 15 cm. or more high. In Australia the commoner 
form, var. Esperi, is sub-cartilaginous and coral-red. 
Widely distributed Mediterranean, West Indies. Western Australia and 
South Australia (Eastern Bays). 
Fig. 57 . — Hypnea musciformis: Habit of 
plant, showing hooked branch 
tips. (After Taylor.) 
