Rhizome 1 mm thick, internodes to 0.9-1.5 cm long; vascular strands with bundle sheath hyaline; sclerenchyma strands few. Rhizome scales peltate, spreading, 3-5 by 0.6-0.8 mm, acute, straw-coloured (rarely), or brown, evenly coloured, remotely and weakly dentate or short-dentate. Fronds simple, strongly dimorphic. Fertile fronds with stipe 1-7 cm long; lamina 1.5-10 by 0.2-0.3 cm, index 1.4 to linear. Sterile fronds with stipe 0.2-4 cm long; lamina 1.4-4 by 1-1.7 cm, index 0.9-2.4, widest at 0.3-0.5 from base; base cuneate to cordate, apex round to acuminate. Venation: costa only distinct; veinlets free or anastomosing, free veinlets excurrent, rarely recurrent. Hydathodes frequent, calcareous scales not persistent. Margin cartilaginous, flat to thickened; notches regularly present, absent or irregularly present in fertile fronds. Sori round, single between adjacent veins, in one row between costa and margin, 2-3 mm wide, slightly sunken.
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