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DescriptionMostly epiphytic (some terrestrial or epilithic) ferns. Rhizome widely creeping to short and suberect, slender, irregularly branched, also with short adhesive hairs. Fronds monomorphic, widely spaced or approximate, arranged in 1 row or tufted. Stipe with a single circular stele; obsolete or distinct, narrowly winged distally or along the entire length. Lamina simple or divided, exceptionally thin (1 cell thick) and delicate, ultimate segments one-veined; rhachis winged or not; venation free. Sporangia borne on slender receptacle within tubular cup-shaped or deeply 2-cleft indusium, homosporus, spores green.