Rhizome 3.5-4 mm thick, internodes to 1-1.5 cm long. Vascular strands with bundle sheath hyaline, or partially sclerified; sclerenchyma strands many to very many. Rhizome scales peltate, spreading, 4-4.5 by 1-1.3 mm, acute, straw-coloured to brown with a lighter margin, remotely and weakly to short-dentate. Fronds pinnate, internally dimorphic. Fertile fronds: stipe 6.5-25 cm long; lamina 13.5-26 cm long, pinnae 5-10 (the lower pairs often wholly or partly sterile); largest fully fertile pinna, stalk up to 0.2 cm, blade 4.5-13.5 by 0.3-0.5(-1.2) cm. Sterile fronds: stipe 4.5 cm long; lamina 8 cm long; largest sterile pinna is 1st from base (usually), stalk 0.2-0.5 cm, blade 6-11 by 1.2-2.2 cm, widest at 2.5-3.5 cm, with a cusp 0.5-2.5 cm long. Venation: main veins on the upper surface not raised, connecting veins distinct. Hydathodes frequent, calcareous scales not persistent. Margin cartilaginous, thickened; notches regularly present, in fertile fronds sporadically to regularly present, less distinct than in sterile parts. Sori round, in one row between adjacent veins, in one row between costa and margin, at 1 mm from costa, 1-2 mm wide, superficial.
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