120 



FERNS : BRITISH AND FOREIGN. 



lated, forming numerous elongated subquadrangular parallel 

 areoles. 



Genus 45. Pinna of barren frond. No. 1. 



1. A. aureum, Linn.; 8w. ; Plum. Fil O04 ; SM. Fit. 1. 1 ; 

 Hook. Gen. Fil. t. SI A; Lowe's Ferns, 7, t. 42. Chry- 

 sodium aureum, Fee. Acrostichum fraxinifolium, 

 .B. Br. Acrostichum marginatum, ScJik. Fil. t. 3 B. 

 Tropics and sub-Tropics of both spheres, generally 

 in swamps. 



4. Platycerce. Rhizome obsolete; sterile frond sessile, de- 

 pressed, conchiform ; fertile fronds stipate, repeatedly forked ; 

 segments broad. Veins compound anastomosing. 



46. PLATYCERIUM, Desv.; Bl. 



Vernation articulate, rhizome obsolete. Sterile fronds sessile, 

 oblique reniform, depressed or elongated and subascending, 

 alternately overlapping each other, forming an epiphytal 

 spongy conchiform mass, often 1-2 feet in diameter. Fertile 

 fronds stipitate, rising from the sinus of the sterile, once or 

 many times dichotomously forked, 2-6 feet in length ; segments 

 broad, obtuse, densely covered with stellated scales, coriaceous. 

 Veins internal, compound anastomosing. Receptacle amorphous, 



