TAB. I. 



Fig. 1. PLATYZOMA. a, portion of a frond; b, pi nn?e (underside) ; 

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



Fig. 2. GLEICHENIA. a, Eugleichenia ; 6, sorus of ditto ; c, 

 Mertensia ; d, sorus ; e, capsule. 



Fig. 3. THYRSOPTERIS. a, sterile, and b, fertile pinnules ; c, sorus 

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



Fig, 4. CYATIIEA. a, fertile pinnule ; b, sorus and involucre ; 

 c, involucre from which the capsules have fallen. 



Fig. 5. HEMITELIA. a, Amphicosmia ; b, Euhemitelia ; c, sorus, 

 with the scale-like involucre. 



Fig. 6. ALSOPHILA. a, fertile segment; 6, sorus cut through 

 vertically ; c, capsule. 



Fig. 7. DIACALPE. a, fertile pinnule ; b, sorus, with perfect invo- 

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



Fig. 8. MATONIA. a, segments, with 2 sori ; b, c, single sori, 

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

 sorus ; e, ditto, the sorus removed ; f, capsule. 



Fig. 9. ONOCLEA. a, b, sterile segment, of Euonoclea; c, 

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

 and involucres. ( Struthiopteris has free venation.) 



Fig. 10. HYPODERRIS. a, portion of a fertile frond ; &, sorus and 

 involucre. 



Fig. 11. WOODSIA. a, Euwoodsia; b. involucre; c, Physe- 

 matium ; d, sorus and involucre of the same. 



Fig. 12. SPII^EROPTERIS. a, fertile pinnule ; b, sorus and stalked 

 involucre ; c, ditto, seen from the underside. 



