Tribe IV. Gen. XIII— XVII. 
§. Eupteris. Veins forked, free. Species 1 — 3. 
§. Litobrochia. Veins more or less anastomosing. Species 4-6. 
Gen. XIII. Lomaria. Sori on a separate frond, capsules 
inally covering the whole surface of the narrow pinnae ; involucre 
narginal, continuous, thin and shrivelled ; sometimes reaching 
o the costa, but when the fructification is ripe often very incon- 
ipicuous. The fronds generally growing in tufts, the central ones 
learing fructification, the rest barren. 1 3 Species, which may be 
hus divided : 
§ A. Sterile 4 fronds, pinnate, having their pinnae stalked. 
Species 1 — 3. 
§ B. Pinnae of barren fronds not stalked but joined by a 
nore or less broad base to the rachis. Species 4 — 12. 
§ C. Frond bi-piimatifid. Species 13. 
Sub-Tribe B. 
Gen. XIV. Davallia. Soras marginal, oval or circular ; 
livolucre rising from the point of a vein, joined to the back of the 
rond by its base or by its base and sides. 1 Species. 
Gen. XV. Cystopteris. Sorus on the back of the frond in 
he middle of a veinlet ; involucre nearly circular but attached by 
; broad base to the sorus ; veins forked and free. 1 Species. 
Gen. XVI. Lindsea. Sorus linear, on or just within the 
nargin, tipping with a line of fructification each of the little pin- 
mles ; involucre opening outwards, formed of two plates, the 
ipper one of the same texture as the frond and formed of it, the 
ower membranous and rising from the ends of the veins. 2 Species. 
Gen. XVII. Asplenium. This genus is distinguished by 
earing on the back of the frond linear sori, covered by a linear 
tivolucre which is attached lengthwise to a veinlet, opening length- 
pise and inwards ; sometimes the fronds are cut or divided be- 
iween every veinlet, when the sori become marginal and the 
Involucres appear to open outwards, but if the whole pinnae be 
arefully regarded, it will be seen that the involucre really opens 
owards its costa. 9 Species which may be divided into : 
§ A. Fronds simply pinnate, pinnae toothed. In one 
pecies the lower pinnae are sometimes pinnate. Species 1 — 4. 
§ B. Fronds bi-pinnatifid, bi-tri-pinnate, sometimes divided 
ito many long narrow pinnules, when the sori become marginal. 
Ipecies 5-8. 
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