东亚鳞毛蕨 dong ya lin mao jue

Nephrodium shikokianum Makino, Bot. Mag. (Tokyo) 13: 62. 1899; Ctenitis shikokiana (Makino) H. Itô; Nothoperanema shikokianum (Makino) Ching.

Plants 56-120 cm tall. Rhizome erect, stout, scaly. Stipe 26-55 cm × ca. 3.5 mm, throughout rachis with dark brown, ovate-lanceolate scales. Lamina ovate-pentagonal, 30-65 × 26-30 cm, not tapered to base, tripinnate, apex shortly acuminate; pinnae ca. 16 pairs, basal 1(or 2) pairs opposite; upper ones alternate, stipitate, obliquely spreading, approximate; basal pair larger than others, lanceolate, ca. 15 × 7 cm, bipinnate, base inequilateral, apex caudate-acuminate; pinnules ca. 15 pairs, alternate, stipitate; basiscopic pinnules larger than acroscopic ones; basiscopic pinnule oblong-lanceolate, ca. 5 × 2 cm, pinnate, base rounded, equilateral, apex acute; ultimate pinnules ca. 10 pairs, oblong, ca. 1.4 cm × 5 mm, base broadly cuneate, margin lobed or deeply pinnatifid, apex obtuse; lobes 4 or 5, oblong, subtruncate at base, entire; secondary pair of pinnae similar to basal pair but shorter, bipinnate; tapered from third pinnae upward, from sixth (or seventh) pair abruptly narrowed, ca. 6 × 1.8 cm, apex triangular. Veins in ultimate pinnule pinnate; veinlets forked or simple, running to frond margin, visible abaxially. Lamina papery when dried, brown, abaxial side of rachis with brown, lanceolate scales. Sori orbicular, terminating veinlet, 4 or 5 pairs on each ultimate pinnule, between costa and lamina margin and in 1 row at each side of costa, exindusiate.

Bamboo forests, mixed forests; 400-1800 m. Guangxi, Guizhou, Hunan, Sichuan, Yunnan [Japan].