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Athyriaceae

蹄蓋蕨科

特徵描述
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特徵描述

作者

SHIEH, WANG-CHUENG, DEVOL, CHARLES E. and KUO, CHEN-MENG

型態特徵

Nearly all terrestrial ferns; rhizome usually short and stout, sometimes creeping and slender; scales thin, light brown to dark brown, lanceolate or ovate. Stipes with 2 vascular strands at base and uniting into a single U-shaped strand above; lamina usually thin, pinnate to decompound, rarely simple; veins usually free, goniopteroid in one genus, and forming areolae in two other genera; some species bearing multicellular septae hairs, usually glabrous; rachis groove generally open to receive rachilla grooves but not in all genera. Sori linear, single or double. J-shaped, sub-reniform or round; indusia usually present, sometimes small and fugacious, in Woodsia borne below the sporangia.

A family of about 15 genera, seven in Taiwan.

參考文獻

Athyrium 蹄蓋蕨屬

作者

SHIEH, WANG-CHUENG, DEVOL, CHARLES E. and KUO, CHEN-MENG

型態特徵

Rhizome dictyostelic, usually stout, erect and covered with persistent stipe bases, rarely horizontal; scales usually thin, ovate-lanceolate and pale brown, rarely narrow and dark brown. Stipe stramineous, tufted, with 2 vascular strands at base uniting into a single U-shaped strand above; lamina usually bipinnatifid to tripinnate, rarely pinnate; texture thin; venation free; rachis and rachillae grooved on dorsal side; often bearing spine - like processes on the upper surface along the costa and or costules. Sori oblong or round, borne along veinlets, usually crossing a veinlet; indusia brown, linear, J- shaped or reniform, margins usually erose. Woodland ferns of temperate regions and on high mountains of the tropics.

About 200 species, 20 in Tawan. This genus needs much more study, differences between some species are small, and variation between fronds of young plants and old ones is often guite large. All Taiwan species grow at altitudes over 1000 m and at higher altitudes they become more abundant.

參考文獻

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