双扇蕨属 Dipteris
1.Dipteris Reinwardt, Syll. Pl. Nov. 2: 3. 1825.
双扇蕨属 shuang shan jue shu
Phymatodes C. Presl.
Plants evergreen, medium-sized to large, terrestrial or epilithic. Rhizomes long creeping, covered with coarse, very long-tapering, non-clathrate bristles resembling scales in dried material. Stipe non-articulate, remote; lamina divided into 2 subequal fan-shaped halves, each with deeply incised lobes; main veins repeatedly forked, remainder of veins finer and copiously anastomosing, with free included veinlets in areoles. Sori numerous, small, orbicular, borne on minor veins over most of abaxial surface of lamina; hairlike paraphyses sometimes present among sporangia; spores monolete, 64 or less per sporangium, pale and smooth. x = 33.
Eight species: from NE India, S China, and Ryukyu Islands to NE Queensland and Fuji; three species in China.
1Lamina lobes narrowly lanceolate, margin smooth, entire.1 D. wallichii 喜马拉雅双扇蕨+Lamina lobes broadly lanceolate or ovate, margin coarsely toothed(2) 2(1)Lamina lobes 8-10, cleft to halfway, pale brown abaxially.3 D. chinensis 中华对囊蕨+Lamina lobes up to 20 or more, deeply cleft to 4/5 of lamina, glaucous abaxially.2 D. conjugata 双扇蕨相关知识
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