Rhizome 2-6 mm thick, internodes to 0.2-1 cm long; vascular strands with bundle sheath hyaline; sclerenchyma strands very many. Rhizome scales pseudopeltate, or rarely peltate, spreading, 2-3.5 by 0.6-1.3 mm, acute, brown, evenly coloured, short-dentate to strongly dentate. Fronds simple, dimorphic. Fertile fronds with stipe 2-12 cm long; lamina 5-29 by 0.9-4.1 cm, index 5.8-10, widest at 0.5-0.7 from base. Sterile fronds with stipe 1-7 cm long; lamina 5-22 by 1-4.3 cm, index 3.1-5.6, widest at (0.4-)0.5-0.6 from base; base very gradually narrowed, apex acuminate in fertile, rounded in sterile fronds. Venation: costa only distinct, or main veins also distinct, raised on upper surface, veinlets anastomosing, free veinlets excurrent and recurrent. Hydathodes absent. Margin cartilaginous, thickened; without notches (rarely), or notches regularly present. Sori round, rarely elongate, confluent within one areole, in 2(-4) rows between adjacent veins, in (2-)5 rows between costa and margin, (0.5-)1.5-2 mm wide, superficial or very slightly sunken.
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