Rhizome 1.5-3 mm thick, internodes to 1-1.5 cm long; vascular strands with bundle sheath hyaline; sclerenchyma strands few to many. Rhizome scales peltate, spreading, 5.5-8 by 0.9-1.5 mm, acute, whitish, straw-coloured, or brown, evenly coloured or (mostly) with a lighter margin, remotely and weakly dentate to short-dentate (sometimes irregularly). Fronds simple, monomorphic. Stipe 0.2-3.5 cm long (always indistinct, sometimes virtually absent). Lamina 1.5-26.5 by 0.7-1.6(-2) cm, index 1.4 to linear, widest at 0.2-0.7 from base; apex usually rounded or obtuse. Venation: costa only distinct, main veins indistinct, on upper surface rarely raised; veinlets anastomosing (free veinlets scarce). Hydathodes absent. Margin not differentiated; without notches or notches rarely sporadically present. Sori round, in one row between adjacent veins, in one row approximately medially between costa and margin, 2 mm wide, deeply sunken, with a slightly raised rim around the mouth, forming high narrow pustules on upper surface.
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