Description:
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Rhizome creeping, pink, subtetragonal, leafy, with erect stems; rhizophores limited to the basal, prone part of the stem, 4-8 cm long, finely pubescent, dark streaked, ventral, most at right angles to the rhizome. Stems erect up to 50 cm long and 3 mm in diameter, spaced about 2 cm apart, usually pink when dry, rounded, subglabrous, sometimes rooting at the top; branches pubescent, forming an angle of 45 °, triangular or deltoid outline, 2-3 pinnate, the basal pair of branches subopposed. Leaves of the main stem homomorphic, subopposite, distant, often more than 1 cm apart, symmetrical, ovate-deltoid in outline, apex pointed, base slightly auriculate, margin toothed, 3 x 2 mm; leaves of the branches heteromorphic, lateral leaves spaced, 3-4 x 1.25-2 mm, often rolled up when dry, apex rounded, upper half of leaf semi-oval, entire, lower half narrowly oblong, serrulate at base, midrib not reaching the top; axillary leaves as long as the lateral ones, entire, elliptic, apex rounded; median leaves spaced apart on the main stem and sometimes subopposed, regularly attenuated and imbricated on the ultimate ramifications, 1.5-2 x 0.6-0.7 mm, ovate, falcate, ciliolate on the inner face, entire on the outer face, acuminate, not awned, outer face long decurrent; axillary leaves 2 x 0.8 mm, subelliptic, apex pointed, base truncate, margin entire or rarely ciliate. Strobili solitary at the tips of the twigs, about 0.5-1 cm long by 1.75-2 mm in diameter, paler green than the leaves. Sporophylls homomorphic, 1-1.2 x 0.7-0.8 mm, ovate-deltoid, acuminate, acute, with two short quadrangular auricles at the base, loosely ciliolate, lighter green than the leaves; heterosporus. |