单行节肢蕨 dan hang jie zhi jue

Polypodium wallichianum Sprengel, Syst. Veg., ed. 16, 4: 53. 1827, based on P. juglandifolium D. Don, Prodr. Fl. Nepal. 3. 1825, not Willdenow (1810); Arthromeris juglandifolia J. Smith; Pleopeltis capitellata (Wallich ex Mettenius) Beddome; P. juglandifolia T. Moore; Polypodium capitellatum Wallich ex Mettenius.

Rhizome 10-15 mm in diam., densely scaly throughout; scales brown, lanceolate, 10-15 × 2-3 mm, margin sparsely toothed, apex acuminate. Stipe stramineous, 15-30 cm, glabrous; lamina imparipinnate, oblong in outline, 40-70 × 30-40 cm; pinnae usually 5-10 pairs, subopposite, sessile, oblique, ovate-lanceolate, 10-20 × 2-4 cm, base rounded, margin entire or undulate, apex acuminate; lamina herbaceous or subleathery, both surfaces glabrous. Sori orbicular, 1 on each side of costa, medial or slightly nearer costa, solitary between lateral veins.

Epiphytic on tree trunks or epilithic; 1500-2500 m. Guizhou, Sichuan, Xizang, Yunnan [Bhutan, N India, N Myanmar, Nepal, N Vietnam].