滇缅鳞毛蕨 dian mian lin mao jue

Acrophorus diacalpioides Ching & S. H. Wu, Acta Phytotax. Sin. 21: 381. 1983.

Rhizome erect or ascending, short, ca. 2 cm in diam., terminal part densely covered with dark brown scales; scales ovate-lanceolate, ca. 1 cm, thickly membranous, sometimes with short fibriform hairs, entire or undulate, acuminate. Stipes tufted, 35-75 cm, 5-8 mm in diam. at base, densely covered with scales same as on rhizome, subglabrous upward; lamina brown-green when dry, ovate, 50-80 × 46-80 cm, always quadripinnate, papery, glabrous or with few nodose hairs along midvein abaxially, sparsely covered with short nodose hairs adaxially, apex acuminate; pinnae 9-12 pairs, opposite, basal pairs 4-18 cm apart, basal pair largest, with short stalk 3-4 mm, spreading, narrowly ovate, 35-45 × 28-32 cm, tripinnate, base slightly enclosing rachis, apex acuminate; pinnules 12-16 pairs, basal one opposite and shortened, alternate upward, with short stalk 1-2.5 mm, upper pinnules slightly ascending, basiscopic pinnule longer than upper ones; ultimate pinnules 14-16 pairs, basal one opposite, alternate upward, subsessile, spreading, distant, narrowly elliptic, median ones longer, 2-3.4 × 0.8-1.5 cm, base truncate, close to rachillae, apex acute or acuminate; lobes 6-8 pairs, spreading, close to each other, rectangular, 5-7 × 3.5-5 mm, base broadly cuneate, margin pinnatifid or undulate, apex rounded; veins obvious adaxially, pinnate on lobes, veinlets often simple, submarginal, hydathodes not obvious; rachis and rachillae stramineous, with narrow longitudinal groove adaxially, densely covered with nodose hairs at base, with 1 cordate brown scale at base. Sori orbicular, ca. 1 mm in diam., terminal on veinlet, 3-5 per lobe; indusium brown, semicircular or ovate-circular, membranous, attached at base.

Dense forests. Yunnan [Myanmar].