211 



TRIBE VIII. ASPLENIE^E PAGE 



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 Prtsl. 101 

 Sori linear or oblong, single, veins free. 



Gciius XXI. Asplenium L. 103 

 Veins free, sori more or less curved, 

 sometimes horseshoe-shaped. 



Genus XXII. Athyrfum Roth no 

 Veins free, some of the sori double, that 

 is, on each side of the vein, others single 

 as in Asplenium. 



Genus XXIII. Diplazium Swartz 116 

 Veins anastomosing ; sori as in Dipla- 

 zium. Genus XXIV. Anisogonium Presl. 120- 



Veins anastomosing ; areoles elongated 

 near the midrib, smaller towards the 

 margin, with free marginal clavate veinlets. 

 Sori linear-oblong. Indusium sausage- 

 shaped, quite covering the sorus and burst- 

 ing irregularly down the centre. 



Genus XXV. Allantodia Wall 121 



