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FOC | Family List | FOC Vol. 2-3 | Pteridaceae | Adiantum

26. Adiantum tibeticum Ching, Acta Phytotax. Sin. 18: 104. 1980.

西藏铁线蕨 xi zang tie xian jue

Plants ca. 30 cm tall. Rhizomes creeping, ca. 1.5 mm in diam., scales dense, brown, lanceolate. Fronds remote, erect; stipe castaneous-brown, glossy, ca. 15 cm, terete, adaxially grooved, distally glabrous; lamina 3-pinnate, ovate in outline, 10-16 × 5-7 cm, distally 1-pinnate; pinnae 4 or 5 each side, oblique upward, shortly stalked; rachises, costae, and stalks zigzag, same color as stipes, smooth; basal pinnae 2-pinnate, narrowly ovate in outline, ca. 6 × 2.8 cm; pinnules 3 or 4 pairs per pinna, shortly stalked, silklike; fertile pinnules flabellate, usually 7-11(-13) × 7-13 mm, thinly herbaceous, abaxially glaucous, adaxially greenish, both surfaces glabrous, base cuneate, oblique to irregularly shaped, apex rounded, with rounded sharp triangular teeth; terminal pinnules slightly larger. Veins multidichotomously forked, obscure. Sori 1 or 2(or 4) on ultimate pinnule; false indusia brownish, orbicular-reniform or narrowly reniform, membranous, upper margin with a large depression, entire, persistent.

Forests by roadsides; 2800-3200 m. SE Xizang (Jilong) [Afghanistan, Bhutan, India, Kashmir, Nepal].


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