滇西金毛裸蕨 dian xi jin mao luo jue

Gymnogramma delavayi Baker, Ann. Bot. (Oxford) 5: 484. 1891; Gymnopteris delavayi (Baker) Underwood; G. marantae (Linnaeus) Ching var. intermedia Ching; Neurogramma delavayi (Baker) Diels; Notholaena bureaui Christ; N. delavayi (Baker) C. Christensen; N. marantae (Linnaeus) R. Brown var. delavayi (Baker) Tagawa; Paraceterach delavayi (Baker) R. M. Tryon; Paragymnopteris delavayi var. intermedia (Ching) X. C. Zhang; P. marantae (Linnaeus) K. H. Shing var. intermedia (Ching) K. H. Shing.

Rhizomes ascending or decumbent, short, stout; scales tan, narrowly subulate. Fronds clustered; stipe chestnut-black, 8-12 cm × 1-2 mm, base slightly scaly and hairy, distally hairy or subglabrous; lamina adaxially pale green, oblong-lanceolate or broadly linear-lanceolate, 5-14 × 2-4 cm, imparipinnate, leathery when dry, abaxially densely covered with brown, pellucid, ovate-lanceolate scales, adaxially glabrous, apex shortly acuminate or caudate; rachis with sparse, narrow subulate scales. Pinnae (5-)10-15 pairs, falcate-lanceolate or lanceolate, 1.5-2.5 × ca. 0.5 cm, shortly stalked (distal pinnae sessile), base rounded or with a macroscopic auricle (sometimes a small oblong segment). Veins obscure, pinna midrib convex abaxially, slightly concave adaxially. Sori usually covered with scales, with 32 spores per sporangium.

Limestone crevices in open woods; 2200-4600 m. Gansu, W Guizhou, Hebei, Qinghai, Shaanxi, Shanxi, Sichuan, Xizang, Yunnan [Bhutan, N India (Uttarakhand), Nepal].

Paragymnopteris delavayi looks very much like P. marantae except for its undivided pinnae and jointed long hairs (rarely with hairy scales with 2 or 3 rows of cells) on stipes. In addition, both are distributed in NW Yunnan, even in the same locality, only the former grows on calcareous substrates and the latter mostly on non-calcareous rocks.