ABSTRACT
Terrestrial fems with usually unlimited growth, solenostelic or protostelic rhizome sub-scandent, primary axis usually dichotomous, axes of higher or ders arising pinnately from axils of forks, veins all free. Sori dorsal, terminal on or at forks of some veins. Sporangia sessile or very shortly stalked. Num ber of sporangia a distinguishing feature for species delimitation.
