绒毛膜叶铁角蕨 rong mao mo ye tie jiao jue

Basionym: Asplenium furfuraceum Ching, Acta Phytotax. Sin. 10: 190. 1965.

Plants 20-30 cm tall. Rhizome long creeping, 1.5-2 mm in diam., apex scaly; scales narrowly triangular to triangular. Fronds remote, up to 12 mm apart, green when dry, herbaceous, subglabrous; stipe slightly shiny, purplish castaneous, 4.5-12 cm, with orange-brown woolly-floccose indument of reduced scales, or subglabrous; lamina 1-pinnate, narrowly oblong-triangular, 12-19 × 3.5-5 cm, base truncate and slightly reduced, apex acuminate to caudate; rachis shiny and purple to purplish castaneous, with similar indument to that of stipe or subglabrous; pinnae 20-25 pairs, almost sessile and color of rachis entering base of stipicel abaxially, trapeziform, middle pinnae 1.6-2.6 × 0.5-0.9 cm, dimidiate, apex acute, base asymmetrical, acroscopic side truncate and parallel to rachis, basiscopic side cut away and narrowly cuneate and entire, acroscopic margin crenate-serrate with retuse teeth; pinnae spreading to slightly erect, basal pinnae slightly reduced and deflexed. Veins distinct, forking and free, each vein ending below a marginal notch, basiscopic side with 3 or 4 veins lacking. Sori medial, elliptic, 2-4.5 mm; indusia persistent, brown, semi-elliptic, membranous, entire, opening toward costa.

● On rocks by streams. W Yunnan.

Hymenasplenium furfuraceum differs from similar taxa by its more densely floccose rachis and stipe. Due to confusion with similar species, the relationships and distribution of this species are not well known. Sporangia contain 64 spores, thus the plants are probably sexual.