Tab. I. 



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

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



Fig. 2. Gleichenia. — a, § Eugleichenia ; h, sorus of ditto ; c, 

 § Mertensia ; d, sorus ; e, capsule. 



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

 and involucre; (/, tlie same cut througli vertically; e, capsule. 



Fig. 4. CvATiiEA. — a, fertile pinnule ; h, sorus and involucre ; 

 c, involucre from whicli the capsules have fallen. 



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

 with the scale-like involucre. 



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

 vertically ; c, capsule. 



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

 lucre ; c, the same, with the involucre bur.^tiiig 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, capsule. 



Fig. 9. Onoclea. — a, h, sterile segment, of § Euonoclea; c, 

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

 and involucres. (§ .Struthiopteris has free venation.) 



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

 involucre. 



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

 mathim ; d, sorus and involucre of the .same. 



Fig. 12. SpiiiEROPTERis. — a, fertile pinnule; 6, sorus and stalked 

 involucre ; c, ditto, seen from the underside. 



