15 
9. D. crassifolia, J. Sm.; Linn.; Sw.; Plum. Fil: t.123. Anaxetum crassi- 
folium, Schott. Gen. Fil. t. 1. 
Has. West Indies, Brazil, and Peru. Cultivated in 1823. 
10. D. hemionitidea, J. Sm.; Wall. P.membranaceum, D. Don, Fl. Nep. 
Hemionitis plantaginea, D. Don, Fl. Nep. 
‘ ae East Indies. Received in 1844 from Mrs. Lawrence of Ealing 
ark, 
1]. D. irioides, J. Sm.; R. Br.; Hook. et Grev. Ic. Fil. t.125.  P. polyce- 
phalum, Wall. Microsorum irregulare, Link. 
Has. Mauritius, East Indies, and New Holland. Introduced by I/r. 
A. Cunningham in 1824. 
**** Drynarie vere, Bory. 
Fronds rigid, of two forms, the sterile oblong-cordate, sinuose or laciniated, 
sessile, the vascular structure rigid and permanent, fertile fronds 
2-3 feet or more in length, sessile or stipitate, pinnatifid or pinnate, 
the segments articulated with the rachis. Sori round, obliquely uni- 
serial or biserial, or transversely uniserial. 
12. D. quercifolia, Bory; Linn.; Schk. Crypt. t. 13. 
Has. Tropics of the eastern hemisphere. Introduced in 1840 by Dr. 
Wallich. 
Oss. Like D. vulgare, the different localities of this species 
have their own peculiar forms, such as difference in texture, more 
or less deeply laciniated fronds, some being sessile, others with a 
long stipes, the margin being entire or in some slightly dentate ; 
but, although some are strikingly different, still I hesitate in 
pronouncing them distinct species. 
Notwithstanding the species comprehended under this last sec- 
tion of Drynaria are all characterized under one head, in having 
compound anastomose venation with compital sori, yet I am of 
opinion that if the various forms of the venation, together with 
some other peculiarities of structure, could be distinctly expressed 
in words, it would be desirable to consider each section as a 
separate genus. I am led to this conclusion by observing the 
well-marked differences in habit and general appearance of the 
species of each section, and, in a general revision of the characters 
of the genera of Ferns, I would be induced to pay more attention 
to the differences in the general habits than I have hitherto 
done; for instance, the formation of the rhizoma and manner of 
attachment or venation of the fronds, present some important 
characters which would much assist in determining the limits 
and affinities of groups. 
