34 
CLASSIFICATION. 
I. (il.)-Aspidieae. 
Sori within inferior involucres, whose 
margin is divided into incurved 
capillary segments 4. Woodsia. 
Sori beneath cucullate or hooded in- 
dusia, attached by their broad base 5. Cystopteris. 
Sori beneath circular peltate indusia, 
attached at their centre 6. Polystichum. 
Sori beneath reniform indusia, attached 
at the notch on their indented side 7. Lastrea. 
I. (iii.)-Aspicnieae. 
Sori beneath oblong curved sometimes 
horseshoe-shaped indusia, attached 
along their concave edge, the free 
margin fringed with capillary seg- 
ments ; venules free 8. Atbyrium. 
Sori beneath simple elongate straight 
indusia, attached along their ex- 
terior side ; venulesfree 9. Asplenium. 
Sori beneath elongate straight indusia 
lying in proximate parallel pairs, 
and opening along the centre of 
each (twin) sorus; venules free... 10. Scolopcndrium 
Sori elongate scattered, all except the 
lowest on each pinna growing 
from the anterior side of the veins, 
hidden among imbricated chaffy 
scales ; indusium obsolete ; venules 
anastomosing at the margin 11. Ceterach. 
I. Iv. Bleclmeae. 
Sori forming continuous lines parallel 
with the midrib, and within the 
margin 12. Blechnum. 
