贡山膜叶铁角蕨 gong shan mo ye tie jiao jue

Basionym: Asplenium changputungense Ching, Acta Phytotax. Sin. 10: 188. 1965.

Plants 28-40 cm tall. Rhizome long creeping, 2-3 mm in diam., apex scaly; scales dark brown, narrowly triangular to triangular. Fronds remote, up to 12 mm apart, green to brownish dark green when dry, herbaceous, subglabrous; stipe shiny, dark purple, 10-20 cm, with yellowish hairs or subglabrous; lamina 1-pinnate, narrowly oblong-triangular, 12-18 × 2.5-4.5 cm, base truncate and slightly reduced, apex acuminate to caudate; rachis shiny, purple, with yellowish hairs or subglabrous; pinnae 20-25 pairs, almost sessile and color of rachis entering stipicel and base of costa abaxially, trapeziform to slightly lunate or upper pinnae subfalcate, middle pinnae 1.3-2.7 × 0.4-0.7 cm, dimidiate, apex subacute to obtuse, base asymmetrical, acroscopic side truncate and parallel to rachis, basiscopic side cut away and narrowly cuneate and entire, acroscopic margin bicrenate to biserrate with retuse teeth; pinnae spreading to ascending, basal pinnae slightly reduced and deflexed. Veins distinct, forking and free, vein ending below relatively shallow marginal notch, basiscopic side with (3 or)4 veins lacking. Sori inframedial to medial, linear, 2.5-4 mm; indusia persistent, brown, semi-elliptic, membranous, entire, opening toward costa.

● Mountain slopes; ca. 2000 m. NW Yunnan.

Hymenasplenium changputungense is morphologically closest to H. adiantifrons, H. szechuanense, and H. furfuraceum. However, the relationships and the distribution of these taxa are not well known and need further study.