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Plants epiphytic or on rock. Stems long-creeping, intertwining, threadlike; hairs brown, sparse. Roots few, delicate. Leaves 1--3-pinnatifid, 2--6 × 0.5--1.5 cm. Petiole short, threadlike, not winged. Blade with inconspicuous glandular hairs or prominent stellate hairs; margins entire to distantly dentate. Soral involucres 2-valved, the halves roundish to ovate. Sporangial receptacle a low mound of tissue included within involucre. Gametophytes persistent, ribbonlike, much branched. Gametophyte gemmae platelike or absent.
Plants small, epiphytic or petrophilous. Rhizome long creeping, or short and erect, slender, filiform. Fronds small to medium-sized. Lamina pinnately decompound, semitransparent, entire or toothed at margin; rachis and/or lamina covered with reddish brown long hairs to glabrescent or glabrous. Involucres bivalvate, deeply cleft nearly halfway to base, or tubular with bivalvate mouth, entire or serrate at apex; receptacles included or projecting. 2n = 22, 26, 36, 42, 44.
Lips of indusium always well developed, broader and longer than the hollow basal part; receptacle usually much shorter than the lips of the indusium
Indusium deeply to shallowly 2-valved; receptacle not or hardly exserted. Genus subcosmopolitan, with about 300 spp.
