OF SOUTH AUSTRALIA. 
81 
Sundry forms have been described by authors as distinct species, but 
Harvey is probably right, in uniting them into one. These are: — 
1. II. Labillardieri (Bory) Montagne. Frond very long, di-tricho- 
tomous, vesicles large, ovoid, the terminal one sometimes 
cylindrical. From deeper water. 
2. H. Sieberi (Bory) Decaisne, Frond short, dichotomous, fastigiate, 
vesicles obconic, truncate at the extremity, terminal ovoid. 
3. H. gracilis Kuetzing. Very slender, barren, the internodes fusiform, 
tapering at each end. On exposed reefs. 
From Albany in Western Australia, South Australia, Victoria, Tasmania, 
New South Wales and Lord Howe Island, New Zealand. 
XIPHOPHORA Montagne. 
Frond flattened dichotomous. No vesicles. Conceptacles scattered on 
the upper terminal parts of the frond, hermaphrodite. Oogonia dividing 
into 4 oospores. 
KEY TO THE SPECIES. 
a. Receptacles prolonged into a sword- like growth, 
up to 15 cm. long X. Billardien 
Montagne. 
aa. Receptacles narrowly linear, similar in shape 
and size to the sterile segments X. chondrophylla 
(R. Br.) Harvey. 
Both are common in Victoria, Tasmania, and New Zealand, and may 
very well occur in South Australia. 
Family DURVILLAEACEAE. 
Allied to Fucaceae by the formation of conceptacles producing 8-spored 
oogonia, but with a homogeneous frond and no separate organs. 
KEY TO THE GENERA. 
a. Frond flat, solid, pinnatifid or subdigitate . . Sarcophycus 
Kuetzing. 
aa. Frond terete, solid, vaguely branched. (Truly 
parasitic on other algae) 
Notheia Bailon 
and Harvey. 
