Abstract
and margins of the blade. Blades oblong-lanceolate, 6-15 cm long, 2.5-3.5(5) cm broad, pinnate-pinnatifid, acuminate at the apex, subtruncate at the base; rhachis alate (wings 0.3-0.7 mm wide on either side); pinnae ascending, alternate, 7-13 on a side below the pinnatifid apex, 1.5-2.5 cm long, short-stalked (the stalks winged like the rhachis), the expanded portion rhombic-acuminate, 1-1.5 cm broad below the middle, deeply pinnatifid, the segments oblique, the largest ones narrowly oblong, obtuse, with lobed margins; costules of basal segments arising oppositely from costa, in turn with opposite or subopposite simple branches, each vein extending to the apex of a lobe. Sori numerous, apical on the lobes or smaller segments; involucres immersed, oblong-turbinate or turbinate, 1.7-2 mm long, the apex subtruncate to slightly flaring; receptacle becoming long-exserted.
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