255 



Fronds more or less paleaceous. 

 Scales few. 



11. A. viscosum, Swartz. 

 12 A. Huacsaro, Ruiz. 

 Scales copious but not matted. 



13. A. tectum, Willd. 



14. A. auricomum, Kunze. 



Scales matted. 



15. A. muscosum, Swartz. 



16. A. lepidotum, Willd. 



17. A. squamosum, Swartz. 



Scales chiefly on the margins and midrib, paleaceous or hair-like. 

 Scales more hair-like than paleaceous more or less deciduous. 



18. A. hybridum, Bory. 



Scales hair-like, confined chiefly to the margins and rib or spread 

 over the surface. 



Scales chiefly on the margins, but sparingly over the other 

 surface. 



19. A. apodum, Kaulf. 

 20 A. cubense, Mett. 



Scales spread more freely over the surface. 



21. A. spathulatum, Bory. 



22. A. Lindeni, Bory. 



23. A. siliquoides, Jenm. 



24. A. villosum, Swartz. 



Veins areolated. 



Scales hair-like, scattered over the surfac 3 . 



25. A. crinitum, Linn. 



Fronds compound. 

 Veins free. 



Fronds palmate or flabellate. 



26. A. peltatum, Swartz. 



Fronds simply pinnate. 



27. A. sorbifolium, Linn. 



Fronds bi-tripinnate. 



28. A. osmundaceum, Hook. 



Veins united. 



Veins united only at the margin. 



29. A. cervinum, Swartz. 



Veins copiously areolated. 



Sporangia not mixed with corpuscles. 



30. A. nicotianaBfolium, Swartz. 



31. A. alienum, Swartz. 

 Sporangia mixed with corpuscles. 



32. A. aureum, Linn. 



33. A. lomarioides, Jenm. 



