287 



majority being of a hardy sun -bearing character. Several species that 

 in every other character agree with this genus, are, by the entire absence 

 of the involucre, or its rudimentary character which prevents its being 

 observed in any but the earliest stage of the sori, placed, according to the 

 varying views on genera of authors in Poli/podium, Phegopteris, and 

 Goneopteris. 



a. Veins free. — Lastrea. 



b. Fronds bipinnatifid, or fully bipinnate in part, rarely 

 simply pinnate, 

 c. Pinnae gradually reduced in the lower half of the frond 

 to small auricle or mammillose glands. 



1. N. basiattenuatum, Jenm. 



2. X. sanctum. Baker. 



3. N. caribaeum, Jenm. 



4. N. Nockianum, Jenm. 



5. N. negligens, Jenm. 



6. N. rigidulum, Baker. 



7. N. oligocarpum, Hook. 



8. N. Kaulfussii, Hook. 



9. N. conterminum, Desv. 



10. N. Sprengelii, Hook. 



11. N. limbatum, Desv. 



12. N. Sherringii, Jenm. 



13. N. resinofoetidum, Hook. 



14. N. Jenmani, Baker. 



15. N. nimbatum, Jenm. 



c c. Lower pinnae not or little shortened. 



16. N. velleum, Baker. 



17. N. flrmum, Baker. 



18. N. crenulaeum, Jenm. 



19. N. stipinlare, Moore. 



20. N. Filix mas, Rich. 



b. b. Fronds decompound, more or less deltoid or triangular, 

 the lowest pair of pinnae largest and deeper on the 

 inferior side. 



21. N. hirtum, Hook. 



22. N. pubescens, Desv. 



23. N. ochropteriordes, Baker. 



24. N. denticulatum, Hook. 



25. N. effusum, Baker. 



26. X. mexicanum, Hook. 



27. N. ascendens, Donnell Smith. 



28. K Grisebachii, Baker. 



29. N. amplum, Baker. 



30. N. villosum, Presl. 



b. b. b. Fronds decompound ovate or oblong- lanceolate, lowest 

 pinnae smallest. 



31. N. patulum, Baker. 



32. N. nemorosum, Jenm. 



a. a. Veins more or less connected, the lowest one or more opposite pairs 

 united, thence running to the sinuses = or to the crenaturm be- 

 tween the lobes or lobules of the margins. — Ennephrodieus. 



