Epiphytic or lithophytic ferns. Rhizome short and radially symmetric or short- or long-creeping, laterally branched or not. Stipes not articulated, short or long, terete, often narrowly winged. Fronds monomorphic, simple, pinnate or 2-pinnatifid, with entire lobes. Veins free, simple or forked or rarely anastomosing, often ending in a hydathode near the margin. Sori circular to elliptic, without an indusium.