台灣植物誌 第二版 Flora of Taiwan, 2nd edition Vol. 1
30. DIPTERIDACEAE 雙扇蕨科
DEVOL, CHARLES E. and SHIEH, WANG-CHUENG
Rhizome woody, creeping, covered with very narrow linear, dark, stiff scales; siphonostelic. Fronds broadly fan-shaped, cleft to base into two equal divisions, each half dichotomously divided into several long linear lobes; main veins dichotomous, with many nearly parallel smaller veins connecting the main veins at right angles, forming oblong areolae, these sub-divided into many small rectangular areolae; stipes stout, longer than lamina, grooved on upper side, without scales except at base. Sori small, round, exindusiate, one per small areola, borne on junction of veinlets; paraphyses mixed with sporangia.
Only one living genus.
1. DIPTERIS Reinw. 雙扇蕨屬
The characters of the genus are the same as given for the family. About eight species, one in Taiwan.
1. Dipteris conjugata Reinw., Sylloge 2: 3. 1824; DeVol in F1. Taiwan 1: 161. pl. 54. 1975. 雙扇蕨 Pl.180, Photo 68
Rhizome about 1 cm in diameter. Fronds fan-shaped, cut into 2 halves, main lobes of each half narrowly lanceolate, with 2 main veins in each lobe, divided over 3/4 of way to base, apices acuminate, margins thickened with coarse serratiion; main veins prominently raised; young fronds densely covered with soft reddish-brown tomentum, especially on apices of lobes, mature fronds glabrous and glaucous beneath.
Distributed in Indonesia, the Philippines, Islands of Pacific, Taiwan and S. W. China.
TAIPEI: Yangmingshan, Kao & Chuang 1683; Kueishan, Huang 7536; Kankou, Hsu 9112. TAOYUAN: Chiaopanshan, Simada 4884; Tachi, Do 407. PINGTUNG: Nanjenshan, Kuoh 13176*. TAITUNG: Is. Lutao, Huang 6995; Is. Lanyu, Huang& Kao 5463.