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Ophioglossaceae A family of primitive, eusporangiate ferns, in which the frond is forked into a sterile vegetative part and a fertile part which bears the massive, more or less sessile sporangia. There are 4 genera. Botrychium and Ophioglossum are cosmopolitan in distribution; Helminthostachys is confined to the Indo-Malaysian region; and Rhizoglossum is S. African.