398 
THE SEAWEEDS 
Jania rubens Lamouroux. 
Fronds 1 cm. to 5 cm. high, densely tufted, dichotomous, many times 
forked, fastigiate; branches erect or spreading, gradually attenuated 
towards the apices. Articulations everywhere cylindrical, without 
prominent angles ; those near the base very short, the upper ones gradually 
ionger ; those in the middle parts of the frond from four to five times longer 
than broad. Apical articulations acute or obtuse, sometimes much 
Fig. 201 . — Jania fastigiata: a, plant; b, 
upper branches, with ceramidia 
in the forks; c, a ceramidium, 
with its two terminal ramuli, 
after the lime has been removed 
by acid; d, spore threads. 
(After Harvey.) 
attenuated. Cystocarps subterminal, urn-shaped, with long horns formed 
of from two to four articulations. Colour pale red, purplish when quite - 
fresh. 
South Australia (St. Vincent Gulf, Encounter Bay, Eastern Bays), 
Atlantic, Mediterranean and Southern Oceans. 
CORALLINA (Tournefort) Lamouroux. 
Frond caespitose, primary frond pinnately branched, ramuli subtripin- 
nate; pinnae edged with elongate pinnellae; the pinnellae simple, equi- 
thick, or subclavate; articulations of the ramuli and pinnae compressed 
or compresso-cuneate, of the pinnellae cylindrical. Conceptacles ovate, 
subspherical, with long pedicels, ecorniculate. 
