脉纹鳞毛蕨 mai wen lin mao jue

Lastrea filix-mas (Linnaeus) C. Presl var. lachoongensis Beddome, Suppl. Ferns Brit. Ind. 58. 1892; Dryopteris pseudodontoloma Ching; D. venosa Ching & S. K. Wu.

Plants 55-85 cm tall. Rhizome erect, stout; scales of rhizome and stipe base pale brown, broadly lanceolate, ca. 1 cm, apex narrowly subulate. Fronds caespitose; stipe dark stramineous, 25-28 cm, ca. 3 mm in diam., longitudinally grooved, glabrous above stipe base; lamina oblong-lanceolate or ovate-lanceolate, 35-45 × 20-35 cm, bipinnate, apex shortly acuminate, basal pinna pair rarely tripinnate; pinnae 8-11 pairs, remote, 5-7 cm apart, shortly stalked, basal pair largest, 12-16 cm, 5-7 cm wide at base, narrowly deltoid, base shortly stalked, double-serrate, approximate, apex blunt-acuminate, basiscopic pinnules longer than acroscopic ones, especially basal basiscopic one longest (2.5-4.5 × ca. 1.5 cm), shortly stalked, pinnatifid, upper pinnules with margin unlobed, only sharply double-serrate; second pair of pinnae similar to basal one but smaller. Lamina thickly leathery, both surfaces glabrous; rachis and costa sparsely clothed with dark brown, lanceolate scales; veins distinctly impressed on both surfaces. Sori 6-12 pairs on upper pinnae, 2 or 3 pairs on lower part of each pinnule, close to costa or costule, in 1 row on each side, approximate; indusia dark brown, orbicular-reniform, papery, persistent.

Mixed forests, ravines; ca. 2200 m. Xizang, Yunnan [Bhutan, India, Nepal].