14 INDEX TO THE GENEEA. 



Son oval on the inner surface of the Indusium. 

 Indusium a projected continuation of the 

 bleached recurved margin of the pinnule 

 itself. 



ADIANTUM. 



Sori on the back, in oblique lines. Indusium 

 attached on the outer side. 



ASPLENIUM. 



Sori on the back, in twin oblique lines. Indusia 

 attached on the outer side, and lapping the 

 one over the other on the inner. 



SCOLOPENDBIUM. 



Sori on the back, in two longitudinal lines, near 

 the centre. Indusia attached on the outer 

 aide, and parted on the inner by the midrib. 



BLECHNUM. 



Sori on the back, forming a continuous line 

 along the margin. Indusium attached to the 

 slightly recurved edge of the pinnulet. 



PTEBIS. 



