adder's-tonguefern
adder's-tongue fern n.
Any of various ferns in the genus Ophioglossum, having leaves divided into a simple, sterile blade and a slender, spikelike spore-bearing segment. Also called adder's-tongue.
  [From the resemblance of the spike at the base of the frond to a snake's tongue.]

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Universalium. 2010.

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