THE FERN WORLD OF AUSTRALIA. 
59 
A. exaltatnm, Sw. Rhizome similar to the last but stronger 
and not forming tubers. Fronds erect, strong, two to five feet long, 
simply pinnate, the rhachis usually covered with a dense scaly 
tomentum. Pinn^ numerous, nearly sessile, articulate on the 
rhachis, lanceolate, mostly acuminate and crenate, obliquely truncate 
at the base and at times auriculate on the upper side ; the longest 
ones three to six 'inches long, with numerous fine forked veins 
obliquely diverging from the midrib, the lower pinnas usually shorter, 
rounded at the end and barren. Sori terminating one branch of the 
veins, forming a regular row usually close to the margin. Indusium 
almost orbicular, laterally attached in a deep sinus, or sometimes 
peltate and opening all round. Very common on the coast rocks 
of tropical Queensland. 
Var. longipinna. Pinnae often six inches long and three-quarter 
inch bi'oad, with the sori at a greater distance from the mai'gin. 
This form is given in the Flora Austr., but the size and form of the 
pinnffi differ so considerable in the species as to make it almost 
impossible to mark distinct forms ; at times the pinnae is of a very 
firm coriaceous texture with a glossy surface, and the sori mid-way 
between margin and midrib. 
A. ramosum, Beauv. Khizome slender, scaly,- creeping up trees, 
over rocks, &c., often to a great length. Fronds varying from a 
few inches to over one foot long, pinnate. Pinnai numerous, 
obliquely oblong, obtuse, crenate, very oblique at the base, articulate 
on the rhachis, the lower side narrowed, the upper broadly truncate 
and often auriculate, one to two inches long, and three to four 
lines broad, but at times mUch smaller. Veins diverging from the 
midrib, once or twice forked. Sori in a regular row between the 
midrib and margin. Indusium orbicular, usually attached in a 
deep sinus, but sometimes peltate. The fronds of this variable 
species are sometimes thickly clothed with hairs. A very abundant 
fern in tropical Queensland scrubs, also in a few places in Southern 
Queensland, and in many parts of N. S. Wales. 
A. unitum, Sw. Rhizome creeping. Fronds one to two feet 
long on long stipites, simply pinnate, pubescent or glabrous. Pinnae 
narrow-lanceolate, three to six inches long, sessile but not adnate, 
or the lower ones on short petiolules, firm, regularly pinnatifid, the 
lobes usually reaching to about the middle, broad, rounded or acute, 
often falcate. Veins pinnate to each lobe, the veinlets of adjoining 
lobes uniting in a vein leading to the sinus. Sori at the end of the 
veinlets forming usually a close row along the margin of the lobes. 
Indusium orbicular-reniform or almost peltate, very small and soon 
disappearing. N. Australia ; near most swamps in Queensland, 
Common also in N. S. Wales ; also in Western Australia. 
A. pteroides, Sw. Rhizome creeping. Fronds one to three 
feet high, pinnate usually more membranous than A. unitum, but 
in form somewhat like that species, glabrous or minutely pubescent, 
stipes long and sometimes scaly at the base. Pinna? four to eight 
inches long and about half an inch broad, often petiolulate, the lower 
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