斜方复叶耳蕨 xie fang fu ye er jue

Aspidium amabile Blume, Enum. Pl. Javae. 2: 165. 1828; Arachniodes amabilis var. fimbriata K. Iwatsuki; A. amabilis var. yakusimensis (H. Itô) Ohwi; A. rhomboidea (Schott) Ching; A. rhomboidea var. yakusimensis (H. Itô) W. C. Shieh; A. yakusimensis (H. Itô) Nakaike; Aspidium controversum Hance; A. rhomboideum (Schott) Wallich ex Mettenius; Byrsopteris amabilis (Blume) C. V. Morton; Dryopteris amabilis (Blume) Kuntze; Lastrea amabilis (Blume) T. Moore; Nephrodium amabile (Blume) Handel-Mazzetti; Polystichopsis amabilis (Blume) Tagawa; Polystichum amabile (Blume) J. Smith; P. controversum (Hance) Ching; Rumohra amabilis (Blume) Ching; R. amabilis var. yakusimensis H. Itô.

Rhizome creeping, succulent at growing apex, 0.8-1.2 cm in diam., moderately scaly; scales pale brown, lanceolate or linear-lanceolate, 7-9 × 2-4 mm, thin and soft. Fronds remote, 0.4-1.1 m; stipe stramineous, 20-55 cm, 3-6 mm in diam., base scaly as rhizome, upward scales diminishing to glabrescent; lamina 2- or 3-pinnate, brownish green when dried, oblong-ovate, 20-60 × 15-40 cm, relatively soft, papery, base cuneate, cordate, or hastate, apex abruptly caudate and forming a conform terminal pinna, rachis with sparse linear scales or glabrescent; lateral pinnae (1-)4-8 pairs, alternate, with 1-1.5 cm stalk, obliquely spreading; lowest ones deltoid-lanceolate, 15-25 × 5-9 cm, base rounded-cuneate, apex acuminate; primary pinnules 10-25 pairs, shortly stalked, proximal basiscopic 1 or 2(or 3) elongated (or not), basal acroscopic one occasionally also longer; (simple primary pinnules and) secondary pinnules 5-15 pairs, rhombic-oblong, 0.8-2.2 × 0.5-1 cm, base acroscopically truncate, basiscopically cuneate, apex acute and aristate, margin especially acroscopic side sharply serrate, aristate; upper 1 or 2 pairs of pinnae sometimes with proximal 1(or 2) pinnules longer, other pinnae linear-lanceolate; glabrescent on both surfaces or axes and veins sparsely with brown linear minute scales abaxially. Sori terminal on veinlets, closer to margin than to midvein, 1-7 pairs per ultimate segment; indusia brown, membranous, and ciliate. 2n = 82*.

Along streams and in gullies in forests or bamboos, also in thickets or under shrubs at forest margins, or sometimes on shaded wet rocks or cliffs; below 100-2100 m. Anhui, Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [S India, Indonesia, Japan, Korea, Nepal, Philippines, Sri Lanka].