Description from Flora of China
Polypodium lonchitis Linnaeus, Sp. Pl. 2: 1088. 1753; Aspidium lonchitis (Linnaeus) Swartz.
Plants evergreen. 16-30 cm Rhizome erect, densely covered with lanceolate brown scales. Stipe stramineous, sometimes brown at base, 2-4 cm, 2-3 mm in diam. at base, densely scaly; scales lanceolate and ovate, toothed. Lamina 1-pinnate, linear-lanceolate or narrowly oblanceolate, 26-60 × 3.5-8 cm, gradually contracted toward base, apex acuminate; rachis lower part scaly abaxially, without proliferous bulbils. Pinnae 30-34 pairs, alternate, subsessile, attached at right angles to rachis or slightly ascendant, lanceolate-falcate, lower pairs gradually contracted to deltoid-ovate, middle pairs 2-2.5 cm × 8-10 mm, bases oblique, acroscopic margins truncate, auricles deltoid, basiscopic margins cuneate, with spinulose teeth, apices acuminate; abaxially with lanceolate microscales; frond texture leathery; venation pinnate, midrib slightly raised abaxially, concave adaxially; lateral veins forked, indistinct. Sori in 1 row on each side of midrib; indusia irregularly erose.
Picea forests; 1600-2000 m. Xinjiang [Afghanistan, NW India, Japan, Kashmir; C Asia, Europe, North America].