120 



FEENS : BRITISH AND FOREIGN. 



lated, forming numerous elongated subquadrangular parallel 

 arcoles. 



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



1. A. aureum, Linn. ; Sw. ; Plum. Fil. 1. 104 ; Sclik. Fil. L 1 ; 

 Hook. Gen. Fil. t. 81 A; Lowe's Ferns, 7, t. 42. Chry- 

 sodium aureum, Fee. Acrostichum fraxinifolium, 

 JB. JBr. Acrostichum marginatum, Schk. Fil. t. 3 B. 

 Tropics and sub-Tropics of both spheres, generally 

 in swamps. 



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

 pressed, conchifonn ; fertile fronds stipate, repeatedly forked ; 

 segments broad. Veins compound anastomosing. 



46. PLATYCEKIUM, Desv.; SI 



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 12 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, 



