30 
THE FERN WORLD OF AUSTRALIA. 
secondary about half ■ inch long ; segments very narrow linear, thin 
one-nerved. Indusia almost embedded in the short inner lower 
lobes, the tube shortly turbinate, the border spreading, often rather 
broad, approaching that of a Hymenophyllum. Found at the 
Richmond River, New England, and Lord Howe's Island in N. S. 
Wales. 
T. parviflorum, Poir. Rhizome creeping, rather thick. Fronds 
broadly lanceolate in outline three to .six inches long, bi-pinnate 
with deeply pinnatifid or pinnate pinnules the segments divided 
into two to three almost setaceous lobes, giving the whole frond a 
fennel-like aspect. Indusia the smallest in tlic genus, not half a 
line long on little recurved stipites near the base of the pinnules, 
turbinate, with scarcely spreading border. Queensland habitat 
Rockingham Bay, York Peninsula. 
XIII. — Hymenophyllum, Sm. Film Fern. 
Rhizome slender, creeping, often much branched and matted. 
Fronds usually small, erect, of a delicate membranous half- 
pellucid texture, variously divided, the lobes usually linear one-nerved. 
Sori terminal or lateral. Indusium of the texture of the frond and 
continuous with it, more or less cup-shaped at the base, and immersed 
in the margin of the frond, the exserted portion deeply divided into 
two broad lobes or valves. Receptacle oblong or linear, shorter 
than the indusium or rarely rather longer. Spore-cases sessile at 
or near its base. Name from hymen, a membrane, and phyllon, a 
leaf. 
H. marginatum, Hook, et Grev. Fronds on a short filiform 
stipes half to one inch long, linear and entire or once or twice 
forked, with central costa and nerve-like margins not toothed. Sori 
solitary and terminal. Indusium about half line long and broad, 
divided nearly to the base into obovoid orbicular valves. Port 
Jackson, N. S. Wales. A rare species. 
H. rarum, R. Br. Rhizome creeping filiform. Stipes capillary. 
Fronds two to four inches long pinnate or deeply pinnatifid; 
segments or pinnae once or twice forked, or three or five lobed, or 
rarely undivided, the upper segments and their lobes confluent with 
the narrowly winged rhachis, the lowest segments separated by a 
capillary rhachis ; lobes linear, one-nerved, not toothed. Sori 
terminal. Indusium as broad as the segment, nearly one line 
diameter, divided to the middle or rather lower into broad rounded 
valves. Found at Sealer's Cove, Victoria, abundant in Tasmania 
where it is said to clothe the trunks of tree ferns with a glistening 
garment of beautiful green. 
H. flabellatum, Labill. Rhizome densely matted, rigid. Fronds 
ovate or lanceolate in outline two to eight inches long, erect or 
decurved, twice or thrice pinnatifid, the lower segments or pinnae 
distant, the rhachis as well as the stipes filiform and not winged, 
the upper smaller ones confluent with the narrowly winged rhachis, 
