Rhizome 6-8 mm thick, internodes to 0.5-1 cm long; vascular strands with bun-dle sheath absent; sclerenchyma strands very many. Rhizome scales pseudopeltate, spreading to squarrose, 5-10 by 2-2.5 mm, acute or contracted to a narrow acumen, brown to blackish (often mottled), evenly coloured or with a lighter margin (sometimes very narrow), strongly dentate, or sometimes with an entire acumen. Fronds pinnatifid to pinnate, monomorphic. Stipe 20-48 cm long; lamina 18-36 cm long, pinnae 1-5 pairs, width of connecting strip up to 0.2 cm (mostly absent); largest pinna is 1-4, blade 13-22 by 1-1.6 cm wide, widest at 4-9 cm, with a cusp 1-4 cm long. Basal pinnae unequally broadly adnate, lamina cut to costa on basiscopic side. Venation: main veins distinct, on upper surface raised, connecting veins also distinct; veinlets free and anastomosing, free veinlets excurrent and recurrent. Hydathodes frequent, calcareous scales not persistent. Margin cartilaginous, thickened; notches regularly present. Sori round, single between adjacent veins, in one row between costa and margin, at 2-3 mm from costa, 2-4 mm wide, superficial.
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