峨眉鳞毛蕨 e mei lin mao jue

Acrophorus emeiensis Ching, Acta Phytotax. Sin. 21: 380. 1983.

Rhizome ascending, short, woody, terminal part densely covered with brown scales; scales ovate-lanceolate, ca. 1 cm, thickly membranous, entire, acuminate. Stipes tufted, 40-80 cm, ca. 1.2 cm in diam. at base, densely covered with scales same as on rhizome, subglabrous upward; lamina brown-green when dry, ovate, 60-85 × 45-70 cm, always quadripinnatifid, papery, glabrous abaxially, sparsely covered with short nodose hairs adaxially, apex acuminate; pinnae 13-15 pairs, opposite, spreading, basal pairs 4-18 cm apart, basal pair largest, subsessile, spreading, narrowly ovate, 35-45 × 28-32 cm, base narrower and slightly enclosing rachis, tripinnatifid; pinnules 14-16 pairs, basal one opposite and shortened, alternate upward, subsessile, basiscopic pinnule longer than upper ones; ultimate pinnules 8 or 9 pairs, elliptic, rounded at apex, broadly cuneate at base, slightly asymmetrical, lobed up to 1/3-2/3 on both sides; veins obvious adaxially, pinnate on lobes, veinlets often simple, submarginal; rachis and rachillae stramineous, with narrow longitudinal groove adaxially, densely covered with nodose hairs at base, with 1 cordate brown scale abaxially, often caducous. Sori orbicular, ca. 0.5 mm in diam., terminal on veinlet, 1 on each lobe; indusium brown, semicircular, membranous, attached at base.

● In shrubs, forests; 800-2700 m. Sichuan.

When Dryopteris emeiensis was transferred to Dryopteris, its original epithet emeiensis is available in spite of the existence of the name D. omeiensis (Baker) C. Christensen (Index Filic. 280. 1905). Although "omeiensis" and "emeiensis" refer to the same mountain (Emei Shan) in Sichuan, China, they are not confusingly similar because they are spelled with a different initial letter.