GENERA OF FERNS. 667 
W. ) 12. A. excelsa, A. Br. 13. A. lepifera, J. Sm. 14. 
A. Tumacensis, J. Sm. 15. A. nitens, J. Sm. 16. A. late- 
brosa, Presi. (Polypodium Wall.) 17. A. munita, Kaulf. 
18. A. vestita, J. Sm. 19. A. aculeata, J. Sm. (Polypodium 
Radd.) 20. A. humilis, J. Sm. 
Obs. To this group also belong 8 or 10 species described 
and figured in Martius’? Cryptogamia, and which form his 
third section Dicranophlebia. The difficulty of determining 
the species of this genus, otherwise than by actual compari- 
son of specimens, makes it probable that some of those that 
I have enumerated as new, may be already described. 
** Sori medial. 
Examp. 21. A. procera, Mart. 22. A. compta, Mart. 
23. A. acuminata, J. Sm. 24. A. brevis, J. Sm. 25. A. 
pruinata, Kaulf. (Polypodium, Sw.) 
bs. The last quoted species differs somewhat in habit from 
the rest of the genus, having more the appearance of a large 
Polypodium; but the sori being furnished with articulated 
hairs, and the receptacle slightly elevated, induce me to 
retain it here. 
Ilust. Hook. et Bauer gen. fil. t. 9, 21, 49, A. Hook. et 
Grev. ic. fil. t. 213, 214, 215. Martius’ Crypt. Bras. t. 40 
to 51 inclusive. 
123. Gymnospuera, Blume. 
(Polypodii sp. Wail.) 
Veins costeform, pinnate; venules simple, direct, free. 
Sori medial, naked. Receptacle elevated, columnar. 
Fronds dipinnate ; pinnules entire, crenate, or pinnatifid, 
smooth, squamose, or aculeate. Sporangia compact. 
Examp. |. G. glabra, Blume. 2. G. squamulata, Blume. 
3. G. gigantea, (Wall.) 4. G. aculeata, J. Sm. 
Ilust. Hook. Gen. fil. t. 100. 
Obs. This genus differs from the preceding, chiefly in 
habit and in its sori being destitute of an indusium, or articu- 
lated hairs, the elevated receptacle constituting the only 
