Isoëtes viridimontana is described and illustrated. Plants of this species are currently known only from Haystack Pond, a small, acidic, oligotrophic lake in south central Vermont. Isoëtes viridimontana is distinguished from other Isoëtes species in northeastern North America by its size (less than 5 cm high) and granulate to rugulate megaspore texture.
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Vol. 104 • No. 1