POLYPODIACE.E. 



87 



mite, jrinnatifid, with an oblique cuneate base ; the middle ones adnate 

 and decurrent; while those toward the point are confluent, entire, 

 subfalcate and obtuse. Segments oblong or triangular-ovate, the margin 

 denticulate, with a single stiff hair seated at the base of the sinus. 

 Fertile fronds narrower, with from 14 to 16 pinnge : these are distant, 

 a little over an inch long (the terminal one the largest), 4 to 6 lines 

 broad, obtuse, with a crenate margin. Veins prominent on both sides, 

 the anastomosing venules slender. 



In the division of the fronds and the form of the pinnse, this species 

 is related to Qymnopteris aliena of Presl, from which however it differs 

 in the absence of free venules in the meshes. It is more closely 

 allied, perhaps, to Acrostichum Quoyanum of Gaudichaud, yet from this 

 it is sufficiently distinct. 



Plate 12.— Fig. 2, 2. Sterile and fertile fronds, of the natural size. 

 2 a. Cross section of the stipe. 2 b. Scale, from the stipe. 2 c, c. 

 Sporangia. — Magnified . 



4. Cyrtogonium scandens, J. Sm. 



Cyrtogonium scandens, J. Sm. in Hook. Jour, of Bofc. 4, p. 154. 

 Acrostichum scandens, Raddi, Plant. Brasil. p. 6, t. 18. 



Hab. Estrella Pass, Organ Mountains, Brazil. 



The figure of Raddi, quoted above, though smaller than our speci- 

 mens, is a tolerably good representation of the species. Raddi also, 

 with a doubt, quotes as a synonyme the Acrostichum fraxinifolium of 

 Presl j but that is indeed a very distinct plant, both in habit and 

 character of its venation. 



5. Cyrtogonium serratifolium, J. Sm. 



Cyrtogonium serratifolium, J. Sm. in Hook. Jour. Bot. 4, p. 154. 

 Acrostichum serratifolium, Mert. ex Kaulf. Enum. Fil. p. 66. 

 Poecilopteris fraxinifolia, Presl.; Hook. Gen. Fil. t. 81, B. 



Hab. Vicinity of Rio Janeiro, Brazil. 



