黑鳞双盖蕨 hei lin shuang gai jue

Plants evergreen, medium-sized. Rhizome slender, creeping, black, 2-3 mm in diam., apex scaly; scales brown or black-brown, shiny, broadly lanceolate, sparsely toothed at margin; fronds separate or approximate. Fertile fronds up to 80 cm; stipe black at base, upward stramineous, up to 45 cm, lower part with sparse scales similar to those on rhizome; lamina 2-pinnate with pinnules pinnatipartite, broadly deltoid, as long as wide, up to 35 cm, apex acuminate; pinnae more than 10 pairs, alternate, slightly ascending, broadly oblong-lanceolate or lanceolate, basal pinnae large, up to 18 × 8 cm, narrowed to base, stalked, apex acuminate; pinnules more than 10 pairs, subspreading, lanceolate or ovate-lanceolate, base broadly cuneate or subtruncate, shortly stalked or sessile, apex usually acuminate; basal 2 or 3 pairs of pinnules shortened, often narrowly ovate, apex obtuse; middle pinnules larger, up to 3.5 × 1 cm, pinnatipartite; pinnule lobes up to ca. 10 pairs, oblong, margin crenate or subentire, occasionally pinnatilobate, apex rounded; basal 1 or 2 pairs of lobes sometimes nearly free; veins pinnate, slightly raised and prominent abaxially, visible adaxially, usually purple-brown, veinlets up to ca. 5 pairs per lobe, simple or forked, reaching lobe margin. Lamina herbaceous when dry, green or brown-green; rachis and costae stramineous, costae, costules, and midribs abaxially ± gray-white soft hairy, more densely hairy when young or fronds glabrous. Sori oblong, up to 3 pairs per lobe, medial-supramedial, single or double on basal acroscopic veinlets; indusia light brown, membranous, opening acroscopically, erose at margin, persistent.

Mixed broad-leaved coniferous forests and broad-leaved forests; 1100-3000 m. Gansu, Hebei, Heilongjiang, Henan, Jilin, Liaoning, Nei Mongol, Shanxi, Sichuan, Xizang, Yunnan [Japan, Korea, Russia; N Europe].

Lower Taxa

• Diplazium sibiricum var. glabrum (Tagawa) Sa. Kurata
• Diplazium sibiricum var. sibiricum