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FOC | Family List | FOC Vol. 2-3 | Aspleniaceae | Hymenasplenium

7. Hymenasplenium latidens (Ching) Viane & S. Y. Dong
[comb. nov.]

阔齿膜叶铁角蕨 kuo chi mo ye tie jiao jue

Basionym: Asplenium latidens Ching, Acta Phytotax. Sin. 10: 187. 1965 ["latedens"].

Plants 25-40 cm tall. Rhizome long creeping, 1.5-2.5 mm in diam., apex scaly; scales dark brown, narrowly triangular to triangular. Fronds remote, up to 13 mm apart, green to brownish dark green when dry, herbaceous, subglabrous; stipe shiny, dark purplish, 9-10(-15) cm, base with narrow scales similar to those on rhizome, with brownish indument or subglabrous; lamina 1-pinnate, narrowly oblong-triangular, 15-25 × 3-5 cm, base truncate, apex acuminate to caudate; rachis shiny, purple, subglabrous; pinnae up to 30 pairs, almost sessile and color of rachis not entering stipicel abaxially, trapeziform to trapeziform-lunate, middle pinnae 2-2.6 × 0.5-0.9 cm, dimidiate, apex truncate to obtuse, base asymmetrical, acroscopic side truncate and parallel to rachis, basiscopic side cut away and narrowly cuneate and entire, acroscopic margin shallowly and regularly bicrenate-serrate with retuse teeth; pinnae ascending, basal pinnae slightly reduced. 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 mm; indusia persistent, brown, semi-elliptic, membranous, entire, opening toward costa.

● On rocks; 1800-1900 m. SE Yunnan (Wenshan).

Due to confusion with similar taxa, the relationships and the distribution of Hymenasplenium latidens are not well known. Hymenasplenium szechuanense is very similar but differs by the characters given in the key and above.


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