Rhizome 1-1.5 mm thick to 1-3 cm long; vascular strands with bundle sheath partially or fully sclerified; sclerenchyma strands few. Rhizome scales peltate, spreading, 4-5 by 0.5-0.9 mm, acute, brown, evenly coloured, remotely and weakly dentate to short-dentate, or irregularly strongly dentate. Fronds simple, dimorphic. Fertile fronds: stipe 1.5-6.5(-9) cm long; lamina 2.2-10(-13) by 0.6-1.6 cm, index 2.4-11, widest at 0.2-0.4 from base. Sterile fronds: stipe 1.3-5.5(-7.5) cm long; lamina 1.5-5(-9.5) by 0.8-2.8 cm, index 1.3-3.3, widest at 0.2-0.6 from base. Venation: main veins on upper surface raised, distinct; veinlets free (rarely), or anastomosing, free veinlets excurrent and recurrent. Hydathodes frequent, calcareous scales not persistent. Margin cartilaginous, thickened; notches regularly present. Sori round, single between adjacent veins (rarely a few areoles with 2 sori), in one row between costa and margin (rarely a few in a second row), 2.5-4 mm wide, slightly sunken.
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