* 
THE FERN WORLD OF AUSTRALIA. 
57 
A. sylvaticnm, Presl. Rhizome short, tliick and scaly. Fronds 
pinnate, one to two feet long. Pinnte membranous, mostly attached 
by the midrib only, or shortly petiolulate, the larger ones six inches 
long, three-quarters to one inch broad, regularly pinnatifid, with 
short rounded denticulate lobes, with a central vein to each lobe and 
several oblique parallel veinlets proceeding from it, bearing linear 
sori extending from the midrib almost to the margin ; indusia of 
the section, single or double, upper pinn^ gradually^ smaller and 
more entire, the uppermost semi-decurrent or confluent: Rocking- 
ham Bay Ranges, Queensland. 
A. maximum, Don. Rhizome short and erect or trunk-like and 
over two feet high. Fronds bipinnate, several feet long and two to 
three feet broad, the larger pinnse closely resembling the entire 
fronds of A. sylvaticum. Secondary pinnae lanceolate, acuminate, 
three to six inches long, three-quarter to one inch broad, pinnatifid 
with short broad denticulate lobes, but the larger ones more deeply 
so than in A. sylvaticum and the smaller lobes more oblique and 
acutely toothed, the pinnee ending in a long lanceolate serrated 
point, the rhachis glabrous or slightly scaly. Sori narrow linear 
and indusia entirely those of A. sylvaticum, to which the species is 
referred by some. Queensland habitat, Rockingham Bay, and 
Daintree River. In N. S. Wales, Richmond, Macleay and Tweed 
Rivers. 
A. polypodioides, Metten. Trunk erect two to six feet high. 
Fronds bipinnate, several feet long and two or more feet broad, 
stipes and rhachis without scales Secondary pinnae mostly three 
to four inches long, lanceolate, shortly petiolulate, acuminate, more 
or less deeply pinnatifid towards the base, the lower lobes lanceolate 
falcate, minutely serrulate, the upper ones gradually shorter. Sori 
on the pinnate veins of the lobes as in the preceeding species but 
much shorter, rather oblong than linear. Indusia of the section 
opening on one or both sides of the vein. Common in the swamps 
of Northern Queensland. 
A. melanoclilamys, Hook. Rhizome erect six inches to one foot 
high, three to five inches thick. Fronds bipinnate, six feet long, 
one to two feet broad, widely spreading, darker colored and not so 
membranous as the last species. Secondary pinntB deeply pinnatifid,* 
segments from oblong rounded and under half an inch to lanceolate 
and above one inch long and then usually crenate with a tooth 
opposite each sorus. Sori and indusia linear, very conspicuous from 
their dark almost black color, reaching usually almost from tlie 
midrib to the margin. Low land, Lord Howe's Island, N. S. 
Wales. 
A. decussatum, Sw. Trunk erect, scaly. Fronds three to four 
feet long, pinnate, with a thick smooth rhachis, the stipes somewhat 
rough and often densely scaly at the base. Pinnae shortly petiolu- 
late or attached by the midrib only, often proliferous in the axis^ 
lanceolate, acuminate, six inches to near one foot long, one to one 
'and a half inches broad, shortly dentate, tjie terminal pinna often 
I 
