CHARACTERS OF TRIBES AND GENERA. 79 



Tribe 19. ADIANTEJ:. 

 Gen. 2. Ex. Adicmtum, Hewardia. 



Tribe 20. CHEILANTHE^;. 

 Gen. 8. Ex. Cheilanthes, Pellece, Cassebeera. 



Tribe 21. PTERIDEAE. 

 Gen. 8. Ex. Pteris, Litobrochia, LoncJiitis. 



Tribe 22. BLECHNEJ:. 

 Gen. 11. Ex. Bleclmum, Lomaria, Woodwardia. 



Tribe 23. ASPLENIE^. 

 Gen. 12. Ex. Asplenium, Scolopendrium, Diplazium. 



B. Ring 1 of sporangia, horizontal, central. 



Tribe 24. GLEICHENIE^:. 

 Gen. 4. Ex. GleicJienia, Matonia. 



Tribe 25. HTMENOPHTLLEJE. 

 Gen. 4. Ex. HymenopJiylhim, Trichomanes. 



C. Ring of sporangia horizontal, apical, in some 

 incomplete. 



Tribe 26. SCHIZE*;. 

 Gen. 8. Ex. Schizcea, Anemia, Lygodium. 



Tribe 27, OSMUNDACE^:. 

 Gen. 2. Osmunda, Todea. 



D. Sporangia destitute of a ring. 



DIVISION III. SCAPHOBRYA. 



Fronds terminal, rising from between two stipuliform or 

 socket-like appendages, and articulate with the caudex. 



Tribe 28. MARATTIACE.E. 

 Gen. 5. Ex. Marattia, Danea, Angiopteris. 

 2. Evolution of the fronds straight. 



Tribe 29. OPHIOGLOSSACEJ;. 

 Gen. 3. Ophioglossum, Helminthostachys, BotrycMum. 



