Epiphytic, epilithic, or rarely terrestrial ferns.
Rhizomes creeping, dictyostelic, bearing scales. Fronds monomorphic or
dimorphic, simple to pinnatifid or 1-pinnate; stipes cleanly abscising near their
bases or not; veins anastomosing or reticulate or free; indument various, of
scales, hairs, or glands. Sori abaxial or rarely marginal, orbicular to oblong
or elliptic, occasionally elongate, or sporangia acrostichoid, sometimes deeply
embedded, sori exindusiate, sometimes covered by caducous scales (soral
paraphyses) when young; sporangia 1-3-rowed, usually long stalks, frequently
with paraphyses on sporangia; spores hyaline to yellowish, reniform, monolete
or greenish, globose-tetrahedral, trilete.