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Plant annual. Stems erect or suberect, very slender, 25-140 mm long, only rooting at base, simple or sparingly branched, branches alternate, 6-12 mm long, all terminating in 1 or 2 strobili 6-12 x 2 mm, Leaves distant, radially symmetrical, green at first, ovate-cordate, acuminate, entire, patent, c. 2 x 1 mm, later re-flexed and yellow. Sporophylls in 4 ranks, broadly ovate, apex tapering acuminate. Mega-spores subrugulose, c. 420-510 p.m. Microspores verrucate-scabrate.
Ephemeral. Stems herbaceous, erect, up to 130 mm high, anisotomously branched, terete, up to 0.2 mm in diam. Lycophylls ligulate, isophyllous, pale green, spaced, thinly herbaceous, sessile, ovate to elliptic, up to 1.5 x 0.6 mm, entire. Strobili heterophyllous, sessile, up to 15 mm long. Sporophylls in 4 ranks, herbaceous, lanceolate, up to 3 x 1 mm, carinate, recurved, entire. Sporangia globose, in axil of sporophylls, isovalvate, up to 0.8 mm in diam.
Annual with erect, slender, hair-like stems, simple or sparsely branched, terminating in 1 or 2 strobili. Leaves thinly herbaceous, isophyllous, lanceolate, distant, ovate. Strobili to 10 mm long, sporophylls lanceolate, to 2 mm long, carinate.
