552 filices—Gymnogranimne. 
Polypodium or Niphébolus Liugua has coriaceous entire 
strap-shaped fronds, rusty tomentose beneath. It is a native 
of Japan and other Eastern countries. 
12. GYMNOGRAMME. 
This is a very large genus containing nearly one hundred 
species, chiefly from tropical climates. Like the last, it has 
naked sori, but here they are linear. The name is from yupros, 
naked, and ypaypy, writing, in reference tv the naked sori. 
1. G. leptophaylla.—This is a dwarf fragile annual species 
with bi- or tri-pinnate tufted fronds and narrow linear pinnules. 
The inner fronds are vn longer stipes, and more fruitful than 
the outer. It is a very widely distributed plant, and may be 
raised from spores with very little trouble. 
Sun-Orver IIl.—_Hymenophyllee. 
Rootstock creeping. Fronds circinnate in vernation, very de- 
licate and almost transparent, with reticulate veins. Involucre 
bivalved or bilabiate. Spore-cases sessile, on a clavate or fili- 
form receptacle surrounded with a complete oblique or trans- 
verse ring. D 
13. HYMENOPHYLLUM. 
Fronds small, twice to four times pinnatifid or pinnate; 
pinnules with a midrib and no lateral veins. Sori marginal, 
axillary or terminal. Involuere bivalved, of the same texture 
as and sunk in the frond, or free. Spore-cases sessile, on a co- 
lumnar receptacle within the involucre; ring oblique. There are 
seventy species known, chiefly from tropical and south temperate 
regions. The name is from du, a membrane, and pvrrov, a 
leaf, from the texture of the fronds. 
1. H. Tunbridgénse.—¥ronds 1 to 4 inches high, ovate, 
pinnate at the base, pinnatifid upwards; pinnules linear, 
undivided or bifid, bristly toothed. Involucre toothed. This 
elegant little plant grows in dense matted patches, and in habit 
resembles more some of the Hepdtice than the true Ferns. It 
is found in moist, shady situations in many parts of Britain, 
and throughout Europe from Belgium southwards, and also in 
the south temperate regions. 
2. H. wniluterdle, syn. H. Wilsoni.—This is very near the 
last, but it has recurved darker green more rigid pinnie, and 
entire lips to the involucres. It has about the same range as 
No. 1. 
