Rhizome 2-3 mm thick, internodes to 1 cm long; vascular strands 6-9, bundle sheath hyaline; sclerenchyma strands many to very many. Rhizome scales peltate, spreading, 3.5-5 by 0.5-1 mm, acute, straw-coloured to brown, evenly coloured or with a lighter margin, shortly dentate (occasionally) to strongly dentate. Fronds simple, strongly dimorphic. Fertile fronds with stipe 6-24 cm long; lamina 4-18 by 0.1-0.2 cm, linear. Sterile fronds with stipe 2-8 cm long; lamina 3.5-9.5 by 1.7-5.5 cm, index 1.2-3.6, widest at 0.2-0.5 from base; base truncate to cordate, apex rounded. Venation: main veins on upper surface not raised or raised, distinct; veinlets anastomosing, free veinlets excurrent and recurrent. Hydathodes on fertile fronds present, calcareous scales not persistent, absent on sterile fronds. Both surfaces distinctly dotted with conspicuous glands in small depressions. Margin cartilaginous, thickened; notches sporadically to (more often) regularly present, absent in fertile fronds. Sori forming a single, longitudinally elongated coenosorus between costa and margin, 1-3 mm wide, superficial.
Home