贵阳铁角蕨 gui yang tie jiao jue

Asplenium cuneifolium Viviani var. vegetius Christ; A. interjectum var. elatum Christ; A. longkaense Rosenstock.

Plants (10-)20-30 cm tall. Rhizome erect, short, apex scaly; scales black, linear, entire. Fronds caespitose; stipe 12-18 cm, semiterete, abaxially shiny castaneous, often green toward rachis, subglabrous, adaxially sulcate and with median ridge; lamina broadly triangular to deltoid, 8-17 × 5-7 cm, apex acuminate-caudate, bipinnate to tripinnate at base; pinnae 5-7 pairs, alternate or basal pinnae subopposite, long stalked, basal pair largest, triangular, 4-9 × 3-6 cm, base truncate, nearly symmetrical, 1- or 2-pinnate, apex acute to acuminate-subcaudate; pinnules (1 or)2 or 3(or 4) pairs, alternate, anadromous, stalked; basal pinnules largest, ovate-triangular, 1.5-3 × 1-2.6 cm, base cuneate, pinnatisect, apex obtuse to acute; ultimate pinnules 1 or 2 pairs, basal acroscopic segment largest, ovate-oblong, 6-14 × 4-9 mm, base cuneate and decurrent on costule, margins serrate, apex obtuse. Costa and basal part of veins raised adaxially, flat abaxially, veins anadromous-subflabellately branching, terminal hydathode visible, not reaching margin. Fronds herbaceous, green; rachis semiterete, abaxially green or shiny castaneous up to middle, subglabrous, adaxially sulcate with green lateral wings and median supravascular ridge. Sori 2-4 per ultimate segment, median on veinlets, linear, up to 6 mm; indusia gray to brownish, linear, membranous, repand to entire, opening toward costa or costule.

In rock crevices in forests; 700-900 m. Guizhou, Yunnan [N Thailand, N Vietnam].