德钦冷蕨 de qin leng jue

Rhizomes long creeping. Fronds distant; fertile fronds 45-60 cm; stipe dark brownish at base, upward stramineous, 20-25 cm, 1.5-3 mm in diam., base clothed with brown hairs and few broadly ovate or lanceolate scales; lamina 3-pinnate, narrowly ovate or ovate-oblong, 25-35 × 15-20 cm, thinly herbaceous when dried, apex acuminate; pinnae up to 10-13 pairs or more, alternate, basal and second basal pinnae largest, subopposite, 5-7 cm apart from second basal pinnae, ascending, ovate-lanceolate, 12-17 × 4-6 cm, base slightly narrowed and inequilateral, with stalk 0.5-1.5 cm, apex acuminate; pinnules 10-15 pairs, anadromous, alternate, usually basiscopic one slightly longer than acroscopic one, basiscopic second and third basal pinnules largest, ovate to broadly lanceolate, 2.5-4.3 × 1.5-2.2 cm, base inequilateral, acroscopic base parallel to costae, basiscopic base broadly cuneate, with stalk 1.5-2 mm, apex acuminate; secondary pinnules 5-7 pairs, basal acroscopic pinnule largest, broadly ovate, 8-14 × 5-8 mm, base narrowly cuneate, pinnatifid, toothed at margin, apex rounded-obtuse; veins visible on both surfaces, forked, terminating in emarginations. Sori orbicular, 1-6 sori per ultimate segment, abaxial on veins; indusia pale green to brownish, orbicular or shallowly cupular, without glands, covering sporangia when young, hidden at maturity. Spores bean-shaped, perispore very densely echinate.

● On rocks in valleys, mountain slopes in Quercus forests, streamsides; 2400-3000 m. NW Yunnan.