240 
THE SEAWEEDS 
Ptilonia australasica Harvey. 
Height 10 cm. to 20 cm., width 8 mm. to 16 mm. Dark red-purple. 
South Australia (Eastern Bays), Victoria, Tasmania. 
Fig. 102 . — Ptilonia australasica : Plant with cystocarps. 
DELISEA Lamouroux. 
Frond filiform but compressed or two-edged, continuous solid traversed 
by a central tube, compound pinnate, the branches pectinate with subulate 
pinnules. Cystocarps ovoid toward the apex of the branch. Tetra- 
sporangia in warts on both faces surrounding the apices, zonately divided. 
1. Cystocarps solitary or binate, seated in the sinus 
of the marginal cilia. Cilia simple D. elegans (Ag.)‘ 
Montagne. 
