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adder's-tongue fern
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Tweet n. Any of various ferns in the genus Ophioglossum, having an erect stem that branches into a single oval blade and a spikelike spore-bearing stalk.Also called adder's-tongue. [From the resemblance of the spike at the base of the frond to a snake's tongue.]  (click for a larger image) adder's-tongue fernsouthern adder's-tongue fern Ophioglossum vulgatum |
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