Rhizome 8-13 mm thick, internodes to 1.5-2 cm long; vascular strands with bundle sheath absent; sclerenchyma strands very many. Rhizome scales pseudopeltate to peltate, spreading (rarely squarrose), 5-9 by 1-2 mm wide, acute, brown, evenly coloured or with a lighter margin (usually not hyaline), strongly dentate with teeth close, very long. Fronds pinnatifid, rarely pinnate, monomorphic; stipe 18-40 cm long; lamina 23-48 cm long, pinnae 5-11 pairs, width of connecting strip 0.1-0.5 cm; base cordate; largest pinna is 2nd-6th from base, 13-27 by 1.4-2.5 cm wide, widest at 5-10 cm, with a cusp 1-5 cm long, basal pinnae narrowed on basiscopic base or cut away to costa. Venation: main veins on upper surface raised, connecting veins distinct or veinlets also distinct; veinlets free and anastomosing, free veinlets excurrent and recurrent. Hydathodes frequent, calcareous scales not persistent (rarely persistent). Margin cartilaginous, thickened; notches sporadically to regularly present (mostly). Sori round, singly between adjacent veins, in one row between costa and margin, at 2-4 mm from costa, 3-4 mm wide, slightly to deeply sunken.
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