Ferns have no true stems.
Pinnae are oblong and rounded, with their edges slightly notched and their surfaces somewhat furrowed. The son, or clusters of spore cases, appear on the upper half of the frond at the back of the pinnules, in round masses toward the base of the segments. The fruits are spores, dustlike and almost invisible. The rhizome is horizontal and creeping. The crown forms a brown, tangled mass.