152 
THE SEAWEEDS 
Gigartina Wehliae Sonder. 
A handsome red plant, 4 cm. to 10 cm. high and as much in spread, 
flabellate-branching, the whole frond girt by a thickened margin. Segments 
papillose on the margin, never on the disc. Substance fleshy, thick, harden- 
ing on drying. 
Described by Sonder from plants sent to him from MacDonnell Bay by 
Mrs. Wehl. 
Gigartina gigantea J. Agardh. 
Fronds large, stipitate ; stipe short, branching, terete but becoming 
flattened ; thallus of young plants obovate to round, in older plants vaguely 
laciniate or proliferous from the margin, at length much expanded with 
lacerate laciniae. Tetrasporangia in thallus. Cystocarps superficial, laxly 
papillose on the margin ; sterile papilli long, ligulate, fertile with cystocarps, 
single, terminal. 
Southern Australia (Encounter Bay in South Australia), Tasmania. 
Fig. 24 . — Gigartina gigantea. 
