Plants 15-20 cm tall. Rhizome erect, short, scaly; scales dark brown, narrowly triangular, ca. 2 mm. Fronds caespitose; stipe shiny or dull blackish purple, 2-3 cm, abaxially terete, adaxially flat with lateral low ridge of distinctly separate fingerlike (digitiform) projections; lamina linear-lanceolate, 12-17 × 1-1.3 cm, attenuate to both ends, 1-pinnate; pinnae 25-32 pairs, opposite or subopposite, sessile and often deciduous, middle pinnae elliptic-triangular to oblong, ca. 7 × 5 mm, base asymmetrical, basiscopic side narrowly cuneate, acroscopic side truncate and parallel with rachis, often auriculate, margin crenate-sinuate to entire, apex obtuse; lower pinnae gradually reduced, becoming rhomboid-flabellate. Costa obscure, venation anadromously pinnate, with few 1(or 2)-forked or simple veins. Fronds subleathery, grayish green when dry; rachis blackish purple to blackish brown, shiny, abaxially terete, upper part of adaxial side shallowly sulcate and with 2 rows of relatively closely set fingerlike projections forming low ridge (often eroded and not easily visible on older fronds), occasionally with scaly bud in axil of lowest pinna. Sori 2-7 per pinna, linear or linear-elliptic, 1-2.5 mm, medial on subtending vein; indusia grayish brown, linear-elliptic, membranous, entire-sinuate, opening toward costa. Spores with lophate perispore, average exospore length 31-35 µm.
Home