Terrestrial ferns with a creeping rhizome or ascending to erect stem, the indument of hairs or paleae. Fronds pinnate in plan, decompound to simple and entire, not articulate to the rhizome. Sori typically marginal and protected by an indusium opening toward the margin, or by a reflexed margin, or elongate along the veins and without an indusium, or covering the whole fertile surface. Annulus sometimes oblique and interrupted, or mostly longitudinal and interrupted, the sporangia opening through a definite stomium. Spores almost always tetrahedral. About 60 genera of temperate and tropical regions. (Munz, Flora So. Calif. 24).