( 2 3 ) 
Growth. Creeping; the black, wire-like rhizomas in¬ 
terlaced, forming matted masses. 
Height. From one inch to three inches. 
Colour. Dull, brownish-green. 
Habitats. Wet rocks or old timber. Not uncommon 
in mountainous districts, but rare in the south¬ 
eastern counties. 
(See also page 53 .) 
GROUP I; GENUS IX; SPECIES II. 
HYMENOPHYLLUM UNI LATER ALE. 
(Wilson’s Film Fern.) 
Plate VII. 
Fronds. Linear, pinnate; occasionally branching so 
as to become bi-pinnate; membranous and 
semi-transparent. Pinnae very deeply pinna- 
tifid ; convex on the upper side. Lobes ob¬ 
long and edged with spines. Rachis slightly 
winged. Stipes black, and about one-third the 
length of the entire frond. Involucres pitcher¬ 
shaped, and smooth on margin. 
Growth. Creeping; the intertwined, black, wiry rhi¬ 
zomas forming matted masses. 
Height. From two to three inches. 
Colour. Dull, brownish-green. 
