D1DYM0CH1.J2NA. IT 



GENUS IV. 



DIDYMOCHL^NA. Desvaux. 



Fronds bipinnate. Caudex erect and arborescent, attaining a 

 height of above two feet, and bearing from its crown large 

 fronds, from three to five feet in length. 



Yeins forked and radiating; venules direct, free, the exterior 

 one fertile. 



Sori elliptical, nniserial, and situated on the apex of a venule. 



Indusium oblong, attached along the centre longitudinally. 



A solitary Exotic species. 



Named from the Greek, in reference to the indusium being 

 double. 



VOL. VI. 



