Ophioglossum vulgatum var. pycnostichum Fernald
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Ophioglossaceae
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Scientific Name
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Description
Variety Description - Blade widest below the middle, more abruptly rounded to the base, dark green, firm; basal sheath leathery and ± persistent; spores avg 35–45 microns; low woods and flood plains, southern, mostly s. of the glacial boundary, s. to Fla. and Mex. (O. pycnostichum)
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Common Names
southern adder's-tongue