Stems ca. 1 mm diam. Leaves entirely dimorphic. Sterile leaves 4--10 × 1.4--2.5 cm. Petiole green to straw-colored, 1/2--3/4 length of leaf, ca. 0.3 mm wide, glabrous. Blade deltate, 2-pinnate, papery to somewhat leathery. Pinnae 2--4 pairs, alternate to subopposite, segments oblanceolate, base cuneate, margins minutely denticulate, apex obtuse, sparsely pilose with stiff white hairs. Fertile leaves 6--25 cm, much taller than sterile leaves. Petiole 3/4--9/10 length of leaf. Pinnae compact, short-petiolulate, 1--6 mm. Spores with ridges anastomosing.
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