形態特徵

• Stipe green, smooth, glossy, 30-100 cm long, 4-6 mm in diameter.
• Primary pinnae 60-100 cm long; pinnules sessile, very glaucous beneath (but specimens dried with heat often losse their white color), 10-20 cm long, 8-25 mm wide, basal pair of pinnules ve5ry short (6-8 cm long); dormant bud covered with very dark brown lanceolate fringed scales; stipule-like bract bipinnatifid, deeply cleft; rachis, rachillae, costae, and undersurface without hairs or scales; margins of ultimate segments with easily abraded small reddish-brown stellate hairs on young fronds; basal segment usually with 1 or more finger-like projections.
• Sori of 3-4 sporangia, with pale stellate scales at base of sporangia.
• Our Taiwan species has often been identifid as <i>D. longissimum</i> (Blume) Nakai which is quite similar, but ours differs in having fronds of thinner texture, being much more glaucous beneath; with dormant bud scales being dark brown but without pale margins; and in not being covered with persistent reddish-brown stellate scales on underside of lamina.

分布

• 世界 : China, Japan, Okinawa and the Philippines.

引證標本

TAIPEI: Wulai, Suzuki 16035; Yangmingshan, DeVol 4477. ILAN: Bonbonshan, Kao 5929; Taipingshan, Kao 4757. HSINCHU: Tapachienshan, Kuo 1741. TAICHUNG: Tahsueshan, Huang 1820; Pahsienshan, Liu, Kuo & Kao 382. NANTOU: Chitou, Kuo 348; Hoshe, Kao 3865. CHIAYI: Mt. Alishan, Kuo 3242. KAOHSIUNG: Tengchih, Kuo 2410. PINGTUNG: Raisya, Matuda 208. TAITUNG: Chihpen, Suzuki 10861; Tawu, Chuang 3454. HUALIEN: Chingshuishan, Shimizu & Kao 11753; Taroko, Sasaki s. n. 1933.

參考文獻

• DEVOL, CHARLES E. and SHIEH, WANG-CHUENG, Flora of Taiwan, second edition 1: 96. 1994.  (Fl. Taiwan 2nd edit.)