闽浙铁角蕨 min zhe tie jiao jue

Asplenidictyum wilfordii (Mettenius ex Kuhn) Nakai; Asplenium curtidens (Christ) Koidzumi; A. fengyangshanense Ching & C. F Zhang; A. laserpitiifolium Lamarck var. morrisonense Hayata; A. morrisonense (Hayata) Hayata; A. wilfordii var. curtidens Christ; Tarachia wilfordii (Mettenius ex Kuhn) H. Itô.

Plants 30-40 cm tall. Rhizome erect, scaly; scales red-brown to black, narrowly triangular, 3-6 mm, entire. Fronds caespitose; stipe dull to semi-shiny, dark brown abaxially, green and sulcate adaxially, semiterete, 12-25 cm, base with brown narrow scales; lamina ovate to narrowly triangular, 10-30 × 5-13 cm, apex acute, 2-pinnate to 4-pinnate; pinnae 8-15 pairs, subopposite to alternate, with distinct stalk 3-8(-10) mm, basal pair largest or slightly reduced, triangular-ovate, 3-8 × 2-4(-6) cm, base asymmetrical, broadly cuneate, 2- or 3-pinnatifid, apex obtuse to acuminate-caudate; pinnules 4-6 pairs, anadromous, basal acroscopic pair largest, ultimate pinnules or segments 2 or 3 pairs, basal acroscopic pair largest, rhombic-cuneiform to linear, 4-12 × (1.5-)4-5 mm, base cuneate and decurrent on costule, 2- or 3-partite, lateral side entire, apex serrate with linear to triangular teeth, apex obtuse to truncate. Veins distinct on both sides, raised adaxially, veinlets 1-4 per segment, not reaching margin. Fronds herbaceous to subleathery, dark green, paler abaxially, yellowish green to brown when dry; rachis dull to semi-shiny, dark brown abaxially becoming green toward apex, green adaxially with raised median ridge, semiterete, scaly; costa green, adaxially shallowly sulcate with prominently raised supravascular ridge, abaxially flat, with small fibrillar scales. Sori 1-3 per segment, linear to oval, 1-3 mm; indusia grayish white, membranous, entire, often opening toward each other. Plants tetraploid: 2n = 144.

On rocks in forests, also epiphytic; 200-2300 m. Fujian, Jiangxi, Taiwan, Zhejiang [Japan, Korea].