198 
THE SEAWEEDS 
All round the South Australian coast 
(Encounter Bay, Investigator Strait, Eastern 
Bays), Victoria. 
Both J. Agardh and De Toni consider H. 
ramalina (Harv.) J. Ag. as a reduced form of 
II. usnea. 
2. Frond decompound-pinnate, rachis flexuose, 
narrowed at base and apex, in the middle to 
4 mm. wide ; pinnae and pinnulae linear- 
lanceolate, patent; the ultimate ramuli minute, 
patent setaceous, close-set II. divaricata 
(R. Br.) Harv. 
South. Australia (St. Vincent Gulf, Investi- 
gator Strait, Eastern Bays). 
Section C. 
Frond broad, flat, dichotomous, or bearing segments from the margins. 
1. Stipe short, very soon expanding into the base 
of the frond ; frond dull-red or purplish, very 
broad (to 60 cm. long and 5 cm. to 8 cm. 
wide), oblong or ovate, polymorphous, simple 
with a margin leaf-bearing or cleft into 
numerous lanceolate segments resembling the 
main frond in a smaller way ; discs smooth 
with scattered cystocarps H. polymorpha 
(Harv.) J. Ag. 
South Australia (Encounter Bay, Eastern 
Bays), Victoria, Tasmania, in deeper water. 
Fig. 64 . — Hymenocladia polymorpha : Showing variations in form. 
