EILICES. 
459 
Suborder IV. Polypodiace.®. Capsules stalked, on a depressed 
receptacle, with an incomplete vertical ring, splitting transversely. 
Involucre placed beneath the sorus. 
Sori globose or oblong, dorsal or marginal. 
Involucre cup-shaped, entire or 2-valved ... 5. Dicksonia. 
Involucre adpressed to the surface of the frond. 
Sori placed at the tip of veins 6. Davallia. 
Sori placed on the back of veins 7. Cystoptbbis. 
Sori linear, marginal. 
Frond simple 8* Vittaria. 
Frond compound 9. Lindsaya. 
Involucre placed above the sorus. 
Sori marginal. 
Involucre bearing the capsules on its under sur- 
face 10. Adiantum. 
Involucre wrapped over the capsules. 
Sori placed in the final sinuses. 
Sori round H* Hypolepis. 
Sori crescent- shaped 12. Lonchitis. 
Sori placed along the edge of the final segments. 
Sori round or oblong 13. Ochropteris. 
Sori linear, not filling up the whole of the seg- 
ments. 
Sori at first in dots, soon confluent in a line . 14. Pell^ea. 
Sori linear from the first 15. Pteris. 
Sori linear, filling up the whole of the segments 
of a special frond 16. Lomaria. 
Sori dorsal. 
Sori linear or oblong 17. Asplenium. 
Sori round. 
Involucre peltate 18. Aspidium. 
Involucre reniform. 
Frond simple 19. Oleandra. 
Frond compound, with pinnae articulated at 
the base 20. Nephrolepis. 
Frond compound, with pinnae not articulated 
at the base 21. Nephrodium. 
Involucre none. 
Sori placed on the veins only. 
Sori confined to the midrib 22. Monogramme. 
Sori dorsal on secondary veins. 
Sori round or rarely oblong 23. Polypodium. 
Sori linear, not anastomosing 24. Gymnogramme. 
Sori linear, anastomosing .25. Antrophyum. 
Sori occupying both veins and interspaces. 
Sori occupying the whole surface 26. Acrostichum. 
Sori forming partial patches 27. Ptatycerium. 
Suborder V. Osmtjndacea;. Capsules stalked, with a short horizon- 
tal ring, splitting vertically. 
The only genus 28. Osmunda. 
Suborder VI. Schiz^acea;. Capsules sessile, crowned with a 
complete ring, splitting vertically. 
The only genus 
29. Schizala. 
