212. 
THE SEAWEEDS 
2. Sporophylls in axillary tufts, branched. 
Laciniae serrate. Rami broad, 3 mm., 
costate p. costatum 
. (J. Ag.) Hooker and Harvey. 
South Australia (Encounter Bay, Investi- 
gator Strait, Eastern Bays). 
Fig. 77 . — Plocamium costatum: a, plant; b, branch with clusters of cystocarps. 
