Rockcap ferns (polypodies) are evergreen and grow in dense colonies on rocks.  They may wither in a drought but quickly become green when exposed to moisture.  Leathery blades are cut into narrow, blunt-tipped lobes.  The form of fertile and sterile fronds is the same.  The sori are round, naked, and prominent and the rhizome is creeping horizontally and is scaly.