形態特徵

• Rhizome 5 mm wide, long creeping; scales narrowly lanceolate, nearly entire, hair-tipped, light-brown with a dark region at the peltately attached base.
• Stipes 1.5-3 cm long, rarely up to 5 cm long, scaly, articulate to very short phyllopodia, (hidden among rhizome scales); fronds 20-40 cm long, 2-4 cm wide, oblong, sides parallel, suddenly narrowed at apex to a caudate tip, base rounded, obtuse, or acute; midrib prominent; veins free, forked near base, nearly parallel from midrib to margin; puberulent along veins on underside; midrib sparingly pubescent and bearing scattered thin lanceolate scales.
• Sori round, borne in a single row on either side of midrib, very near the midrib; indusia reniform, ciliate.
• <i>O. undulata</i> has been reported from Taiwan but our species differs from <i>O. undulata</i> (Willd.) Ching in having very short phyllopodia, in having sori very near the midrib, and in having fronds with a caudate apex.

分布

• 世界 : Nepal, Northern India, Burma, SW. China.

引證標本

NANTOU: Wanghsiang, Shieh & Tsai 8936*. CHIAYI: Mt. Alishan, Huang & Kao 1773.

參考文獻

• SHIEH, WANG-CHUENG, DEVOL, CHARLES E. and KUO, CHEN-MENG, Flora of Taiwan, second edition 1: 203. 1994.  (Fl. Taiwan 2nd edit.)