OF SOUTH AUSTRALIA. 
137 
younger ones densely whorled with minute ramelli ; ramelli 
dichotomo-multifid, with patent axils and sharply acute apices. 
Cystocarps terminating short branches. Tetrasporangia numerous, 
sessile on the ramelli. Height 7 cm. to 15 cm., colour a deep 
brownish-red. 
Western Australia, South Australia (Encounter Bay, Robe), 
Victoria. 
B. — Plumatae. 
Ramelli of the whorls pinnate or dichotomous, rather rigid, patent or 
incurved, passing from a thicker base into an obtuse apex, 
a. Fronds from the base articulate, ecorticate. 
Wrangelia protensa HaTvey. 
Fronds 15 cm. to 30 cm. long, excessively and densely branched; 
the principal branches long and virgate, several times compound ; 
the ultimate branches 2 cm. to 5 cm. in length, simple, attenuated. 
Fig. 10 . — Wrangelia protensa. Fig. 11 . — Wrangelia verticillata. 
All the branches and their divisions are very erect. The older parts 
of the frond, though pellucidly articulate and ecorticate, become 
shaggy with stupose filaments, which issue from the dissepiments, 
and are deflected downwards like rootlets. Every articulation of 
the branches and ramuli bears a pair of opposite ramelli, very erect 
or appressed, simple or branched from the base, often pinnulated 
in the lower part, but always with a long excurrent point. Tetra- 
spores scattered on the pinnulae of the ramelli. Substance soft 
and gelatinous. Colour a rosy-red. 
Tasmania, Victoria. 
