形態特徵

• Rhizome long-creeping, 2-3 mm wide; scaly at apex, scales clathrate, dark brown, narrowly lanceolate, long acuminate.
• Fronds dimorphic, texture thin; stipes 1-3 cm apart; sterile fronds about 30 cm long, and to 8 cm wide, broadly ovate, suddenly cuneate towards base, then gradually winged nearly to base of stipe; lateral main veins parallel, very distinct, reaching nearly to the margin before forking; venation reticulate with included veinlets; margins entire; fertile fronds narrowly linear, 5-10 mm wide, 20-30 cm long; stipe 25-35 cm long, not winged.
• Sporangia acrostichoid, completely covering the underside of the narrow frond; margins narrowly reflexed.

分布

• 世界 : India, Mlalaya, Vietnam, South China, the Philippines and Polynesia.

引證標本

TAIPEI: Wulai, Yamamoto s. n. 1929. ILAN: Taipingshan, Sasaki s. n. 1932. TAICHUNG: Pahsienshan, Suzuki s. n. 1929; Tungshih, Simozawa 457. NANTOU: Hoshe, Huang 2196; Meiyuan, Kao 6657; Kuantaochi, Kuo 235*. CHIAYI: Mt. Alishan, Sasaki s. n. 1932. PINGTUNG: Paiwan, Matuda s. n. 1917. TAITUNG: Tawushan, Masamune 1607.

參考文獻

• SHIEH, WANG-CHUENG, DEVOL, CHARLES E. and KUO, CHEN-MENG, Flora of Taiwan, second edition 1: 494. 1994.  (Fl. Taiwan 2nd edit.)