西宁冷蕨 xi ning leng jue

Cystopteris ×kansuana Blasdell.

Rhizomes slender, shortly creeping, sparsely scaly. Fronds approximate; fertile fronds 10-19 cm; stipe chestnut-colored, 6-11 cm, less than 1 mm in diam., base with few brown lanceolate scales, upper part glabrate; lamina bipinnatifid, pale green or dark brown when dried, lanceolate, 4-10 × 1.3-3 cm, thinly herbaceous, base obtuse, apex long acuminate; pinnae 5-8 pairs, basal pinnae 1-2.4 cm apart from, and slightly shorter than, second basal pinnae, subopposite; upper pinnae alternate, ascending, subsessile or shortly stalked (stalk 1-2 mm); lower pinnae ovate to narrowly ovate, 9-20 × 4-8 mm, acroscopic base broadly cuneate, basiscopic base narrowly cuneate, lobed to narrow costal wings, apex acuminate; pinna segments ca. 3 pairs, ascending; basal acroscopic segment largest, narrowly ovate, 4-8 × 2-3 mm, crenate or dentate-pinnatipartite, apex acute or obtuse-rounded; upper segments oblong or linear-oblong, acuminate, with 2 or 3 small teeth, entire at margin. Veins in basal acroscopic lateral segment pinnate, upper or basiscopic lateral veins simple or occasionally forked, terminating in laminar emarginations. Sori yellow-brown, orbicular, medial on veins; indusia pale yellow-brown, ovate, entire at margin, persistent. Spore with echinate perispore.

● Shaded rock crevices; 3000-4500 m. Gansu, Qinghai, Sichuan, Xizang, Yunnan.