34 
THE SEAWEEDS 
South Australian Species. 
Section Filicoidecie. Like Ferns. 
1. C. scalpellifonnis (F. Brown) C. Agardh. 
2. C. sertulariodes (Gmelin) Howe. 
Section Hippuroideae. Like Ilippuris (Mares 4 ail). 
3. C. longifolia C. Agardh. 
4. C. Harveyi F. V. Mueller. 
5. C. Clift oni Harvey. 
6. C. obscura Sonder. 
Section Lycopodioideae. Like Clubmosses. 
7. C. Brownii Endlicher. 
Section Araucarioideae. Like Firs. 
8. C. Hedleyi Weber van Bosse. 
9. C. hypnoides (R. Brown) C. Agardh. 
10. C. flexilis Lamouroux. 
Section Sedoideae. Like Stonecrops. 
11. C. sedoides (R. Brown) C. Agardh. 
12. C. vesiculif era Harvey. 
13. C. simpliciuscula. 
Section Opuntioideae. Like Cacti. 
14. C. cadoides (Turn.) C. Agardh. 
Section Filicoideae. 
Fronds fern-like with pinnate or pinnulate lobes. 
Caulerpa scalpdliformis (R. Brown) C. Agardh. 
This is a conspicuous and elegant species, with bright green fronds.. It 
was noted by the earliest collectors, and is one of the three which received 
their specific names from Robert Brown himself. 
The surculus is smooth and glossy but becomes furrowed when dry. The 
assimilators are stalked and erect, 1 to 2.5 cm. apart, several centimetres 
(rarely up to 30 cm.) high, and a little more than 1 cm. wide, they often 
start a fresh growth by constricting and then widening out again. They are 
linear-lanceolate in outline, flat with a thicker median axis like a midrib, 
and are closely pectino-pinnate with alternate, linear, 
flat teeth or lobes. The lobes are about as long as the width of rach 
and come off at an acute angle. , .. T 
The species grows on rocks near low water mark, usually tangled with 
2 S ; or on stony bottoms to a depth of at least 12 fathoms, 
where the finest fronds develop. It oeenrs around the coast of Western 
Australia, South Australia, Victoria, and Tasmania. An allied species, 
