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Information Rhizome cylindric, short to long, with usually a single leaf; leaf-bases not persistent; petiole 1.6–10 cm. long, subterranean for c. 1/3 of its length. Sterile lamina 2–6 x 0.2–1 cm., narrowly to very narrowly elliptic, sharply acute, sometimes shortly mucronate. Fertile spike up to 14.4 cm. long, inserted at the base of the lamina, with up to 30 pairs of sporangia, apex shortly or long-apiculate.

Information Perennial herb with deciduous aerial parts. Rhizome fusiform, 10–15 mm long, 2–3 mm wide;roots numerous, descending, becoming horizontal, probably proliferous. Leaves 1 or 2; stipe 16–25 mm long, 30–40% of its length subterranean, stipe:lamina length ratio 0.7:1, stipe bases shortly persistent; lamina mid-green, held at ± 80° from the ground, elliptic, flat in sterile leaves, concave from above in fertile leaves, 25–50 mm long, 5–10 mm wide, length:width ratio ± 4.5:1, apex acute, apiculate, base narrowly cuneate; venation elongate throughout, with some secondary venation and included blind veinlets, median band lacking; epidermal cells elongate with wavy walls; stomata strongly aligned. Fertile spike 55–90 mm long, with 11–19 pairs of sporangia, fertile spike:lamina length ratio ± 2.5:1. Spores 40–45 µm in equatorial diameter, alete, muri broad, of uneven width and somewhat discontinuous, lumina reduced to narrow pits, granules lacking. Fig. 2/2 (p. 7).

Information Plants terrestrial. Rhizome linear, erect, to 28 mm long, to 2 mm in diameter; roots few, fleshy, subhorizontal, proliferous. Leaves single, rarely two; stipe to 50% subterranean, to 80 mm long, old stipe bases not persistent; tropophore firmly herbaceous, green, held at ±60-90° from the horizontal, elliptic to narrowly elliptic, narrowly cuneate to attenuate, acute, apiculate, flat to canaliculate adaxially, to 35 mm long, to 5 mm wide. Venation reticulate. Sporophore to 130 mm long, with up to 16 sporangium pairs, apiculus acute. Spores globose, alete or trilete, muri reticulate, narrow, lumina flat-bottomed, of variable diameter, granules lacking, 42-60 (m in equatorial diameter. Figure 8A.

Information Perennial herb with deciduous aerial parts. Rhizome linear, (5–)9–30(–41) mm long, (1–)1.5–2(–3) mm wide; roots few, fleshy, sub-horizontal, proliferous. Leaves commonly single, rarely two; stipe (14–)30–84(–110) mm long, 30–50% of its length subterranean, stipe:lamina length ratio 1–1.8:1, old stipe bases usually not persistent; 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, (8–)21–48(–75) mm long, (2–)4–8(–12) mm wide, length:width ratio 3.3–8.8:1 (depending upon shading), apex acute, apiculate, base narrowly cuneate to attenuate, margins even; venation elongate throughout with some secondary venation and a few blind veinlets, median band lacking; epidermal cells sub-isodiametric with wavy anticlinal walls; stomata sometimes aligned. Fertile spike (20–)47–101(–162) mm long, fertile spike:lamina length ratio 2.2–3:1, with (6–)8–16(–30) pairs of sporangia. Spores of variable equatorial diameter, (37­–)42–61(–75) µm, alete or trilete, rarely monolete, muri clearly reticulate, uniformly narrow, lumina broad, flat-bottomed and of variable diameter, the muri sometimes coalescing to form areas of fine reticulation enclosing small pit-like lumina, granules absent. Fig. 2/8 (p. 7).