TAB. Ill, 



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, 

 with involucre turned ba<:k. 



Fig. 28. LLAVEA. a, barren segment ; 6, portion of the fertile 

 frond ; c, the same, unrolled. 



Fig. 29. CRYPTOGRAMME. a, segment of barren frond ; 6, segment 

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



Fig. 30. PELL^EA. a, pinnule of Platyloma ; 6, portion of the 



Fig. 31. PTERIS. a, b, Eupteris ; c, Heterophlebium ; d, e, 

 Poesia ; f, 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 ; f, spores. 



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

 with the involucre partially unrolled. 



