形態特徵

• Rhizome stout, prostrate.
• stipe and rachis green, turning purplish beneath (with age); with a continuous or broken row of linear aerophores on each side of stipe, base of stipe covered with a mass of long (1.0-1.5 cm) shiny brown hairs, upper part of stipe and rachis covered with small, appressed flaccid hairs becoming glabrescent; c. s. of stipe with a long linear 3-lobed, wavy bundle.
• Fronds tripinnatifid, 1.5-3 m long; glaucous beneath, pinnae stalked, medial pinnae 40-80 cm long, lower pinnae shortened, deflexed; pinnules short stalked, usually of about equal length on either side of rachilla; ultimate segments apiculate, margins serrulate-serrate; veinlets free, fertile ones simple, sterile often once forked. Sori of several pairs on pinnule lobes; indusia outer lobe usually larger.
• Spores with equatorial ridge annulate or annulotrilete; exine with proximal face bearing 3 rows of short laesural ridges, distal face with a distal ridge.

分布

• 台灣 : rare in Taiwan.
• 世界 : in India, Southeast Asia to Indonesia and the Philippines.

引證標本

TAICHUNG: Wuchen, Hashioka s. n. 1932. NANTOU: Lienhuachih, Huang 7567; Sun Moon Lake, Kuo 1827.

參考文獻

• DEVOL CHARLES E. and SHIEH, WANG-CHUENG, Flora of Taiwan, second edition 1: 140. 1994.  (Fl. Taiwan 2nd edit.)