Rhizome 2-3 mm thick, internodes to 1-1.5 cm long; bundle sheath hyaline to fully sclerified; sclerenchyma strands many to very many. Rhizome scales peltate, spreading, 4.8-9 by 1-1.5 mm, acute or contracted to a narrow acumen, brown, evenly coloured, usually entire, rarely remotely and weakly dentate, sometimes also coarsely dentate at base. Fronds simple, dimorphic or internally dimorphic, fertile parts often forming a distinct apical spike. Fertile fronds with stipe 0.5-6 cm long (usually not very distinct). Lamina 5.5-49 by 0.1-0.4 cm (fertile part), index 9-98. Sterile fronds with stipe 1-2 cm long; lamina 3-8 by 0.7-1.9, index 2.5-9, widest at 0.5-0.7 from base. Fertile area 0.4-2.5 cm wide. Venation: costa only distinct, main veins indistinct, on upper surface not raised or raised; veinlets mostly anastomosing, free veinlets scarce. Hydathodes absent. Margin not differentiated or cartilaginous, thickened; notches regularly present. Sori round or longitudinally slightly elongate, in one row between adjacent veins, marginal, in one row between costa and margin, 3 mm across, deeply sunken, forming pustules to 1-1.5 mm high on upper surface.
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