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Trise VIII.—AspLenize 
Indusium linear or oblong or horse- 
shoe-shaped, sometimes double; — sori 
attached to the veins. 
Scri linear ; veins forked, more or less 
parallel, connected just within the margin 
‘by a transverse vein. (This connection is 
not quite constant.) Fronds simple. 
Genus XX.—Thamnopteris Presl. 
Sori linear or oblong, single, veins free. 
Geaus XXI—Asplenium L. 
Veins free, sori more or less curved, 
sometimes horseshoe-shaped. 
Geaus XXII.—Athyrium Roth ; 
Veins free, some of the sori double, that 
is, on each side of the vein, others single 
as in Asplenium. 
Genus XXIJI.—Diplaziuom Swartz 
Veins anastomosing ; sori as in Dipla- 
zium. Genus XX1V.—Aaisogonium Prest. 
Veins anastomosing ; areoles elongated 
near the midrib, smaller towards the 
margin, with free marginal clavate veinlets. 
Sori linear-oblong. Iudusium  sausage- 
shaped, quite covering the sorus and burst- 
ing irregularly down the centre. 
Genus XXV.—Allantodia Wall 
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