OF SOUTH AUSTRALIA. 
211 
2. Sporophylls axillary, clustered, simple, arcuate. 
Laciniae serrate. Rami broader, to 3 mm. 
diameter P. Preissianum 
Sonder. 
South Australia (Encounter Bay, Eastern Bays). 
Fig. 75. — Plocamium Preissianum: a, plant; b, part 
of a pinna, with conceptacles ; c, vertical 
section through a conceptacle and 
branch; d, part of a pinna with axillary 
stichidia; e, three of the stichidia 
removed; f, a tetraspore. (After 
Harvey.) 
(P. homatum J. A g. is like P. leptophyllurn, but is of a brighter red, 
and the lowest of the alternating pinnellae is recurved in a 
prominent hook. It grows on Lord Howe and Norfolk Islands and 
on the coast of Queensland 50 miles north of Brisbane.) 
B.— Alternating series of pinnellae in pairs. Cystocarps sessile on the 
margin of the ramuli. 
1. Sporophylls in the axils, bushy, branched. 
Laciniae mostly entire. Rami slender, 1 mm. ; 
not ribbed p angustum 
(J. Ag.) Hooker and Harvey. 
South Australia (Encounter Bay, Investi- 
gator Strait, Eastern Bays). 
