Flora of the Netherlands Antilles , Volume 1 - Issue 1 p. 1- 84
Epiphytic or usually terrestrial ferns with a short fleshy rhizome bearing only one or a few, mostly fleshy, leaves, these erect, petiolate, continuous with the rhizome, the lamina usually divided into a sterile and a stalked fertile portion; veins free or reticulate. Sporangia with a wall composed of several layers of cells, opening with a slit, containing numerous trilete thick-walled subspherical spores of one kind. Four genera, two monotypic, the others with about 60 species of almost world-wide distribution.
|Flora of the Netherlands Antilles|
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Kramer, K.U. (1962). Pteridophyta. Flora of the Netherlands Antilles, 1(1), 1–84.