形態特徵

• Evergreen fern; rhizome stout, suberect.
• Fronds tufted, 35-85 cm long. Stipes 12-30 cm long, pale green, almost covered with pale-brown, lanceolate scales, most of scales bend inwards or toward base; scales lanceolate, entire, pale brown, 10-12 mm long and 1.5-2 mm broad at base of stipe, decreasing in size upwards.
• Lamina ovate, bipinnate to tripinnatifid, 20-55 cm long, 15-35 cm broad, apex pinnatifid; basal pinnae subopposite, equal to or more or less shorter than the next one; scales on rachis dense, similar to those on stipes but smaller. Pinna falcate, apex pointing upward, the biggest one 10-20 cm long, 2.5-5.5 cm broad; costa grooved, blackish purple, sporadically covered with linear scales and multicellular hairs on the adaxial side, pale green, covered with linear to lanceolate and bullate scales and multicellular hairs on the abaxial surface.
• Pinnule sessile, oblong to lanceolate, the biggest one 10-32 mm long, 6-12 mm broad, margin loosely crenate to shallowly lobed, apex round or truncate, base auricled and truncate to shallowly cordate, glabrous on the adaxial surface, sporadically covered with multicellular hair on the abaxial surface; the basal pinnules of the basal pinnae usually the shortest; costule blackish purple, groove-like sunken on the adaxial side. Sori reniform, near to margin than to costule, in one or two rows on each side of costule; indusia round-reniform, sub-entire to entire; spore monolete, bean-shape, perispore rugulo-saccate. 32 spores/sporangium.

分布

• 台灣 : northern Taiwan.
• 世界 : Korea, Japan, central and southern China.

引證標本

Taipei: Peitou District, Huti, near Mt. Shamaoshan, growing at the crevice of big rock under the forest, Jan. 22, 2001, Lu, P.-F. 341 (TAIF). Taoyuan Co.: Lungtan, Shangkaoyuan, at the roadside near the secondary forest, Mar. 5, 2003, Chang, H.-M. 6246 (TNU). Hsingchu Co.: Chupei, Mt. Niuhulian, near Tientetang Temple, under the secondary forest, May 22, 2000, Chiang, H.-L. 1146 (TAIF).

參考文獻

• Ho-Ming Chang, Ho-Long Chiang, Pi-Fong Lu, Jenn-Che Wang and Wen-Liang Chiou. 2007. Taiwania 52(3): 238-242.