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Rhizome linear, up to 4 mm long, up to 2 mm in diam.; roots with proliferous buds. Leaves commonly single, rarely 2. Stipe up to 25 mm long, 30-50% subterranean. Lamina mid-to bright green, held at 60-90° from the horizontal, elliptic to very narrowly elliptic, rarely oblanceolate, flat or shallowly canaliculate in fertile leaves, up to 30 x 5 mm, apex acute, apiculate, base narrowly cuneate to attenuate, margins even. Fertile spike up to 85 mm long, with up to 12 sporangia pairs, apiculus acute, up to 1.3 mm long.
Terrestrial. Rhizome linear, erect, lacking persistent old stipe bases. Leaf single, rarely 2, erect, sterile lamina narrowly elliptic to elliptic, up to 35 x 5 mm; fertile spike with up to 16 sporangium pairs; stipe up to 80 mm long, subterranean for up to half of its length.
A herb. It is a fern. It keeps growing from year to year. The above ground parts die back. It has narrow rhizomes of underground stems 9-30 mm long. The leaves are usually single. The leaf blade is green and narrowly oval.
