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Fronds fan-like, sori placed on each side 

 of the narrow segment of the frond, linear, 

 elongated, opening towards the midrib. 



Genus XXVI. Adi riopUris Lijk 122 



TRIBE IX. 



Indicium more or less rounded or 

 kidney-shaped (rarely elliptical), attached 

 either by the centre or sinus. 



Sori elliptical on the tip of a veinlet but 

 within the margin. Indusium attached 

 longitudinally on the centre of the linear 

 receptacle, free all round the edge. Veins 

 pinnate, the lower pair of veinlets anasto- 

 mosing. Fronds bipinnatifid. 



Genus XXVII. Mtsochlana R. Br. 123 



Sori globose ; veins free ; texture lea- 

 thery, teeth awned. 



Genius XXVIII Polystichum R^h. 124 



Indusium round, attached by the 

 centre ; veins generally anastomosing with 

 free veinlets proceeding from their junc- 

 tion. Genus XXIX Cyrtomium Prtsl. 127 



Veins copiously anastomosing with free 

 included veinlets in the areoles. Sori 

 ound. Indusium round or kidney-shaped. 



