Lepisorus thunbergianus Ching

Rhizome 1-1.5 mm thick, not glaucous, brownish when dry, short-creeping, phyllopods nearly contiguous (internodes rarely to 1 cm long in material from other lo-cations). Anatomy: vascular strands c. 6, without sclerified bundle sheaths, sclerenchyma strands 5-15, scattered, ground tissue not sclerified. Rhizome scales peltate, slightly spreading, 1-1.5 by 2-3 mm, widest near the point of attachment, clathrate with a central band of dark thick-walled, opaque cells, margin irregularly dentate, apex acute. Fronds monomorphic, indistinctly stipitate; stipe to 1 cm long, lamina 5-13 by 0.5-1 cm (dry), widest at 1/3-1/2 its length, base very narrowly acuminate, apex acute to somewhat apiculate, glabrous or with few, small, deltoid, clathrate scales near the base of the costa on the lower surface. Venation: completely hidden. Hydathodes present. Sori mostly slightly elongated longitudinally, to 4 by 2.5 mm, in a single row halfway between midrib and margin, sometimes protruding when old, superficial, densely covered with scales when young. Sporangia stalked, capsules c. 0.3 mm long, with 14-16 indurated annulus cells. Soral scales round, peltate, clathrate, to 0.5 mm diam. Spores hyaline, 68-74 by 40-48 µm, coarsely verrucate.