Rhizome 1-2 mm thick, internodes to 0.5-1 cm long; vascular strands with bundle sheath hyaline; sclerenchyma strands many, mainly central. Rhizome scales peltate, spreading, 2.9-4.5 by 0.7-1 mm, acute, brown, evenly coloured or with a slightly lighter margin, remotely and weakly to short-dentate. Fronds simple, strongly dimorphic. Fertile fronds with stipe 6.5-18 cm long; lamina 9-15.5 by 0.2-0.25 cm, linear. Sterile fronds with stipe 2-7 cm long; lamina 2-5.5 by 1.6-2.5 cm, index 1.2-3.4, widest at 0.1-0.5 from base; base cuneate to truncate, apex rounded. Venation: main veins on upper surface raised, distinct; veinlets anastomosing, free veinlets excurrent and recurrent. Hydathodes sometimes present to frequent, calcareous scales not persistent. Margin cartilaginous, thickened to strongly thickened; notches regularly present, absent in fertile fronds. Sori longitudinally elongate or confluent across veins, forming a longitudinal coenosorus, a single one between costa and margin, 1 mm wide, superficial.
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