草质假复叶耳蕨 cao zhi jia fu ye er jue

Polypodium hasseltii Blume, Fl. Javae Filic. 195. 1851; Acrorumohra hasseltii (Blume) Ching; Arachniodes hasseltii (Blume) Ching; Athyrium hasseltii (Blume) Ching; Byrsopteris hasseltii (Blume) C. V. Morton; Dryopteris adiantoides T. Suzuki; D. obovata (Baker) C. Christensen; D. psilosora Tagawa; Lastrea obovata (Baker) Beddome; Nephrodium obovatum Baker; Phegopteris hasseltii (Blume) Mettenius; Polystichopsis hasseltii (Blume) Holttum; Rumohra hasseltii (Blume) Ching.

Rhizome apex densely covered with castaneous scales. Fronds 0.7-1.1 m; stipe stramineous, rather paler when dried, 30-60 cm, 2-4 mm in diam., base and lower parts densely scaly; scales dull brown, lanceolate, ca. 15 × 1.5 mm, upward glabrescent or with scattered smaller scales; lamina 3-pinnate, deltoid or ovate-oblong, 45-60 × 25-35 cm, rachis glabrescent; pinnae 10-16 pairs, alternate, stalked, obliquely spreading; lowest pinnae ovate-lanceolate, 18-25 × ca. 7 cm, base rounded-cuneate, apex acuminate; primary pinnules ca. 15 pairs, shortly stalked, lanceolate or oblong; basal basiscopic ones larger, broadly lanceolate, 7-9 × 2.5-4.5 cm; secondary pinnules 9 or 10 pairs, shortly stalked or sessile distally, ovate-oblong, ca. 1.3 × 0.7 cm, slightly auriculate at base above, cuneate below, apex obtuse, margin shallowly pinnatifid with lobes blunt at apex, basal ones often with acroscopic lobe free and apex with 2 or 3 obtuse teeth; upper pinnae gradually reduced to pinnatifid lamina apex. Lamina herbaceous, yellowish green when dried; costae (axes of ultimate pinnules) sometimes with minute brown lanceolate scales abaxially. Sori terminal on veinlets, 1-5 pairs per ultimate segment, medially between midvein and margin, and exindusiate.

Broad-leaved forests, especially in valleys; 400-1800 m. Hainan, Taiwan, Yunnan [NE India, Indonesia, Japan, Malaysia, Nepal, New Guinea, Philippines, Singapore, Sri Lanka, Thailand, Vietnam; Pacific islands].