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DescriptionTerrestrial or lithophitic ferns. Rhizome subterranean, short-creeping, branched, with closely-spaced dimorphic fronds. Sterile frond lamina simple, narrowly linear, with a simple, central midrib, glabrous or spacely set with hairs, grass-like. Fertile frond very narrowly linear with a terminal, simple or dichotomously branched, comb-like structure. Sporangia in 2 rows, one on either side of each fertile pinna, homosporous.