Tab. IL 



Fig. 13. DrcKSONiA. — a, b, § Balantium; c, § Patauia. 



Fig. 14. Dkparia. — a, fertile segment; b, single sorus and invo- 

 lucre : c, ditto cut through vertically. 



Fig. 15. LoxsoMA. — a, fertile segmeni; b, sorus and involucre; 

 c, ditto cut through vertically ; d, capsule and accompanying hairs. 



Fig. 16. Hymenophyllum. — a, fertile portion; 6, sorus and invo- 

 lucre ; c, ditto cut through vertically ; d, capsule. 



Fig. 17. Teichomanes. — a, fertile portion ;, b, c, sori, involucres, 

 and columella or receptacle ; d, capsule. 



Fig. 18. Davallia. — a, a, § Humata ; b, sorus, the involucre 

 forced back ; c, § Eudavallia; d, § Microlepia ; e, § Loxoscaphe. 



Fig. 19. Cystopteris. — a, fertile pinnule ; b, sorus covered by the 

 involucre ; c, sorus with the involucre forced back. 



Fig. 20. Lindsaya. — a, § Eulindsaya. — Gen. 20 bis. Fig. 20. b. c. 

 Dictyoxiphium, upper side, the sorus forced back showing the one- 

 lipped involucre ; c, small portion of the same, the sorus removed. 



Fig. 21, Adiantum. — a, fertile jnnnule (in a few species the vena- 

 tion anastomoses) ; b, involucre forced back to show the sorus situated 

 on the involucre. 



Fig. 22. OcHROPTERiS. — a, fertile portion ; b, involucre forced 

 back to show the sorus at the base of the involucre. 



Fig. 23. LoKCHiTis.— a, fertile portion; b, single sorus. 



Fig. 24. Hypolepis. — a, fertile portion ; b, single pinnule, with 

 sori. 



