82 
THE SEAWEEDS 
SARCOPHYCUS Kuctzing. 
Conceptacles scattered over the whole frond, hollowed out in the 
cortical stratum, communicating with the surface by a pore, dioecious. 
Both antlieridia and oogonia borne on branching filaments. 
Sarcophycus potatorum (Labill.) Kuetzing. 
Attachment a thick scutate disc, 10 to 15 cm. in diameter. Stipes soon 
compressed, and widening and flattening upwards till lost in the base of 
the lamina, 15 to 30 cm. long. Lamina 3.5 to 7 metres long or more and 
6 mm. thick, simple or once or twice forked, the segments strap-shaped 
of great length, 15 to 30 cm. broad. Margins undulate. Colour dark olive. 
The largest and coarsest of all the Kelps— Bull Kelp of Tasmania— 
extremely tough and leathery, rejoicing in the most boisterous turmoil of 
the surf. 
From Cape Northumberland to Cape Howe; Tasmania, all coasts. 
NOTHEIA Bailon and Harvey. 
Frond filiform, irregularly branched, solid. Parasitic on Hormosira, the 
haustoria penetrating the base of the conceptacles of the host. Con- 
ceptacles scattered over the whole frond, hollowed out in the cortical 
stratum, opening on the surface by a pore, dioecious. Antlieridia and 
oogonia borne on branched filaments. 
Notheia a no mat a Bailon and Harvey. 
Fronds solitary from each conceptacle of Hormosira, 7.5 to 20 cm. long, 
at first simple, then multifariously pinnately branched and bushy, the 
branches proliferous. Stipes cylindrical, ramuli linear-fusiform, narrowed 
at each end. The axis is solid, composed of longitudinal interwoven 
filaments; the periphery of parallel, radiating, coloured filaments. Colour 
a yellowish-olive or pale brown, turning dark on drying. The substance, 
when fresh, is cartilagino -coriaceous. 
South Australia, Victoria, Tasmania, New South Wales to Port Stephens, 
New Zealand, following Hormosira Banksii. 
Family SPLACHNIDIACEAE. 
Frond homogeneous, no special organs, cylindrical tubulose with fluid 
within, pinnately branched on all sides, branches similar cylindrical very 
obtuse at apex. The outer wall consists of two layers of cubical 
epidermal cells, and three layers of polygonal to ovate cortical cells. Within 
these are strands of filaments longitudinal in direction and traversing the 
periphery of the mucilaginous mass which fills the interior of the frond. 
Conceptacles are scattered over the whole frond. No antlieridia observed. 
The unilocular sporangia at a later stage are divided into zoospores, 500 
