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Ophioglossum (adder's tongue, snake's tongue; family Ophioglossaceae) A genus of ferns with the sterile blade(s) usually simple (rarely lobed) with reticulate veins, and the sporangia sunken along the opposite sides of a simple spike, opening by transverse slits. There are about 40 species, found in most parts of the world.

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adder's-tongue, name for a fern genus (Ophioglossum). Adder's-tongues are classified in the division Pteridophyta.