马鞍山双盖蕨 ma an shan shuang gai jue

Asplenium bantamense Baker.

Rhizome creeping, black-brown, with black-brown, thin, marginally thick, dentate scales; fronds approximate. Fertile frond more than 1 m; stipe stramineous, 15-40 cm, stiff, grooved adaxially, base like rhizome, scaly, glabrous; lamina 1-imparipinnate, ovate or ovate-elliptic, 10-50 × 8-15 cm; lateral pinnae 3-6 pairs, all equal in size, alternate or subopposite, oblique, shortly stalked, narrowly elliptic or ovate-lanceolate, ca. 18 × 4 cm, base rounded or rounded-cuneate, margin regularly thickly crenate (crenations ca. 1.5 mm tall) or repand throughout, apex acuminate; apical pinna similar to lateral pinnae, but often with 1 or 2 auricles at base, upper pinnae nearly pinnatifid; costae raised, rounded abaxially, shallowly grooved adaxially; veinlets prominent on both sides of pinnae, subspreading; veins nearly pinnate into 6 thin veinlets, reaching laminar margin. Lamina subleathery, brown-green when dry, glabrous on both surfaces. Sori and indusia linear, mostly double, occasionally single, subspreading, on 3 or 4 veinlets per group, usually on 2 basal veinlets.

● Broad-leaved forests; below 100-300 m. Fujian (Changle), Guangdong (Fanyu, Hong Kong), N Taiwan (Jilong, Taibei).