Tab. III. 



Fig. 25. Cheilanthes. — a, fertile pinna ; b, portion of the same, 

 one involucre turned back. 



Fig. 26. Cassebeera. — a, fertile pinna; b, portion of the same, 

 with sorus. 



Fig. 27. Onychium. — a, fertile segment ; b, portion of the same, 

 witli involucre turned ba<;k. 



Fig. 28. Llavea.— a, bai-ren segment ; 6, portion of the fertile 

 frond ; c, the same, unrolled. 



Fig. 29. Cryptogramme. — a, segment of barren frond ; b, segment 

 of fertile frond ; c, section of the same, unrolled. 



Fig. 30. Pell^a. — a, pinnule of § Platyloma ; b, portion of the 

 same. 



Fig. 31. Pteris. — a, b, § Eupteris ; c, § Heterophlebium ; d, e, 

 § Poesia ; / occasional double involucre of the same ; g, § Campteria ; 

 h, § Litobrochia ; i, § Amphiblestra : all, portions of the frond selected 

 to show both fructification and venation. 



Fig. 32. Ceratopteris. — a, b, portion of the fertile frond ; c, sec- 

 tion of the same, unrolled ; d, e, capsules ; /, s]iores. 



Fig. 33. LoMARiA. — a, barren pinna ; 6, fertile pinna ; c, the same, 

 with the involucre partially unrolled. 



