208 
THE SEAWEEDS 
Chylocladia fruticuloso (Reinbold) De Toni. 
A dwarf plant less than an inch high, epiphytic on Cymodocea. Fronds 
caespitose, terete, densely branched laterally. Cystoearps large, sub- 
globose. Tetrasporangia in somewhat dilated ramuli. 
South Australia (Investigator Strait). 
ERYTHROCOLON J. Agardh. 
Frond constricted into large joints separated by narrow isthmuses, 
branches di-trichotomous or verticillate. Interior cells very large, rounded- 
cubical disposed parallel to the face of the frond, at length gelatinous 
and gradually dissolved in the inflated or hollow frond ; exterior cells much 
smaller, crowded, coloured. Cystoearps scattered over the internodes, 
small, prominent, containing within the large hollow pericarp a small 
simple basal nucleus. Tetrasporangia not seen in Australian species. 
Erythrocolon Muelleri (Sond.) De Toni. 
A short, solid, cartilaginous stipe breaking up into numerous trichotomous 
branches 10 cm. to 15 cm. high. Branches fastigiate, pretty regularly 
trichotomous, constricted into joint-like oblong internodes, 6 mm. to 20 mm. 
long, separated by short, narrow, solid nodes. The terminal internodes 
ovate, the basal long and pyriform. Colour a dull purplish-red. 
Western Australia, South Australia (LeFevre Peninsula, Investigator 
Strait and Robe) ; New South Wales (Botany Bay). 
Fig. 73 . — Erythrocolon Muelleri : Some branches with minute 
cystoearps. 
