西藏钩毛蕨 xi zang gou mao jue

Plants ca. 75 cm tall. Rhizomes short and erect, including stipe bases with sparse scales and short hairs. Fronds clustered; stipes ca. 30 cm, dark brown proximally, distally to rachises brownish stramineous, shortly hairy distally; laminae lanceolate, ca. 45 × 18 cm, nearly tapering to bases, pinnate-pinnatifid, acuminate and pinnatifid at apices; pinnae ca. 20 pairs, above middle alternate, spreading or proximal ones subopposite, reflexed, sessile, linear-lanceolate, 8-9.5 × 1.4-1.7 cm, nearly flat-truncate and slightly narrowed at base, pinnatifid nearly to costae, acuminate or caudate at apices; segments ca. 20 pairs, oblong, entire along margins. Veins evident abaxially, veinlets simple, 8 or 9 pairs per segment, proximal pair arising from base of costules and all reaching margins above sinuses. Laminae papery, when dry dark green abaxially, adaxially somewhat brown, both surfaces including rachises with dense short acicular hairs and few thick and long acicular hairs. Sori orbicular, dorsifixed slightly above middle of veinlets; sporangia each with 1(sometimes 2) hooked hairs near top.

● Broad-leaved forests; ca. 1500 m. SE Xizang (Mêdog).