Terrestrial or epilithic ferns, rarely scandent large or moderate-sized.
Rhizome usually erect (trunk like) or scandent stem bearing scales that are
often dark, long and narrow. Fronds spirally arranged on the rhizome. Lamina
commonly large and coarse, rarely simple, commonly pinnatifid or pinnate with
undivided narrow pinnae, occasionally simple or lobbed to pinnatifid, rarely
pinnate + pinnatifid to bipinnate. Veins pinnately arranged. The characteristic
feature of this family is the position of the continuous sori close on each
side of the midrib and protected by an elongated flap-like indusium attached to
the vein. Spores monolete, bilateral.