OF SOUTH AUSTRALIA. 
63 
Section Heteromorphae. 
'ronds arising from a short common rounded stem, some merely 
pmatifid leaves, others heteromorphous, the lower part forming a 
pmatifid leaf, the upper passing into a terete branching rachis, bearing 
fi orm leaves, vesicles, and receptacles. The broader leaf-like parts carry 
nmerous small glands (cryptostomata). Vesicles minute, ellipsoid, beaked. 
KEY TO THE SPECIES. 
i. Lobes of leaves and lower portions simple, 
oblong and obtuse 8. heteromorphum 
J. Agardh. 
a. Lobes of leaves and lower portions bipinnatifid, 
sublanceolate, acuminate 8. halitrichum 
(Aresch.) J. Agardh. 
Section Cladomorphae. 
Common caulis compressed, rugged ; lower fronds in the junior stage of 
■ plant resembling a pinnatifid leaf, later, as the upper fronds, develop- 
>• into branches themselves ramulose, the ramuli bearing leaves, vesicles 
d receptacles. Vesicles minute, ellipsoid, aristate. 
KEY TO THE SPECIES, 
a. Leaves all normally mature, compound pinnati- 
fid-dichotomous. 
b. Vesicles petiolate, minute, ellipsoidal, apicu- 
late S. Sonderi J. Agardh. 
bb. Vesicles absent S. muriculatum 
J. Agardh. 
a. Leaves, inferior pinnatifid, superior simple sub- 
linear 8. linearifolium 
(Turn.) J. Agardh. 
Section Phyllomorphae. 
Common stem (caulis) rounded; fronds all distichously decompound, 
, e rachides of the branches flat with a midrib, and winged, emitting on 
<th margins alternate pinnate leaves, the upper segments narrow, part 
ibfiliform, some transformed into vesicles and receptacles. The vesicles, 
re size of a pea, spherical and mutic. 
Tropical and subtropical, confined to Australia and New Caledonia, not 
■ry likely to be found in South Australia. The four species, 8. Peronii 
Yiert. ) Ag., S. decurrens (R. Br.) Ag., 8. r>oryi Ag., and S. scabripes 
cr v are very similar in appearance. In fact Sonder united S. Boryi with 
decurrens, not even admitting it to the rank of a variety. 
