OF SOUTH AUSTRALIA. 
223 
lateral and dilated, generating a solitary sorus 
within the margin. Colour rosy-red N. uncinatum 
(Turn.) J. Agardh. 
(Acrosoninm uncinatum (J. Ag.) Kylin). 
2. Frond narrow, almost freely expanded, not cling- 
ing to other plants by hooks, more or less 
dilated above the middle, bearing above lobes 
more or less palmately decompound, ultimate 
rounded obtuse, at length generating a solitary 
sorus in the disc. Small, 2 cm. to 4 cm. long, 
1 mm. to 3 mm wide N. minus (Sond.) 
Harvey. 
( Acrosonium minus (Sond.) Kylin). 
South Australia (Eastern Bays). 
3. Frond broad, dilated and fan-shaped above, 
membranaceous, finely-veined even to the apices. 
Sori numerous, scattered, especially evolved in 
upper pinnate-lobed segments. Colour sordidly 
purpurescent. 10 cm. to 15 cm. long. 
a. Scarcely or not caulescent below N. affine Harvey 
(. Hymenema afffnis (Harv.) Kylin). 
Recorded in South Australia from Encounter Bay and 
Eastern Bays. 
b. Markedly caulescent below N. Curdieanum 
Harvey. 
(. Hymenema Curdieana (Harv.) Kylin). 
in which I include N. validum J. Agardh 
and N. polyanthum J. Agardh. These 
species have been recorded from 
Encounter Bay, Gulf St. Vincent, Investi- 
gator Strait, and Eastern Bays. 
