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Ophioglossum

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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"Ophioglossum." A Dictionary of Plant Sciences. . Encyclopedia.com. 22 Aug. 2017 <http://www.encyclopedia.com>.

"Ophioglossum." A Dictionary of Plant Sciences. . Encyclopedia.com. (August 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ophioglossum

"Ophioglossum." A Dictionary of Plant Sciences. . Retrieved August 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ophioglossum

adder's-tongue

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

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"adder's-tongue." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 22 Aug. 2017 <http://www.encyclopedia.com>.

"adder's-tongue." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 22, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/adders-tongue

"adder's-tongue." The Columbia Encyclopedia, 6th ed.. . Retrieved August 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/adders-tongue