Tab. I. 



Fig. 1. Platyzoma.— a, portion of a frond j h, pinnse (underside) ; 

 c, fertile pinna laid open, showing veins and a sorus ; d, capsule. 



Fig. 2. Gleichenia. — a, § Eu^leichenia ; h, sorus of ditto j c, 

 § Mertensia ; d, sorus ; e, capsule. 



Fig. 3. Thyrsopteeis. — a, sterile, and h, fertile pinnules ; c, sorus 

 and involucre ; d, the same cut through vertically ; e, capsule. 



Fig. 4. Oyathea. — a, fertUe pinnule ; 6, sorus and involucre ; 

 c, involucre from which the capsules have fallen. 



Fig. 5. Hemitelia. — a, § Amphicosmia j 6, § Euhemitelia ; c, sorus, 

 with the scale-like involucre. 



Fig. 6. Alsophila. — a, fertile segment; 6, sorus cut through 

 vertically j c, capsule. 



Fig. 7. DiACALPE. — a, fertile pinnule ; h, sorus, with perfect invo- 

 lucre j c, the same, with the involucre bursting open ; d, capsule. 



Fig. 8. Matonia. — a, segments, with 2 sori ; h, c, single sori, 

 covered with the involucre ; d, involucre laid open, showing the 

 sorus ; e, ditto, the sorus removed ; f, cap^e. 



Fig. 9. Onoclea. — a, b, sterUe segment, of § Euonoclea; c, 

 fertile pinna of ditto ; d, single fertile pinnule, enclosing the sori 

 and involucres. (§ Struthiopteris has free venation.) 



Fig. 10. Hypodereis. — a, portion of a fertile frond ; h, sorus and 

 involucre. 



Fig. 11. WooDsiA. — a, § Euwoodsia; h. involucre; c, § Physe- 

 matium ; d, sorus and involucre of the same. 



Fig. 12. SpHjEeoptbeis. — a, fertile pinnule ; b, sorus and stalked 

 involucre ; c, ditto, seen from the underside. 



