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''Cyathea gigantea'' is a species of tree fern native to northeastern to southern India, Sri Lanka, Nepal to Myanmar, Thailand, Laos, Vietnam, the Malay Peninsula, as well as central Sumatra and western Java. It grows in moist open areas at an altitude of 600-1000 m. The trunk of this species is erect and may be as tall as 5 m or more. Fronds are bi- or tripinnate and usually 2-3 m long. The rachis is long, dark to black in colouration and rough in appearance after the fall of scales. These scales are dark brown, glossy and have a narrow paler margin and fragile edges. Sori are round and indusia absent. Large and Braggins (2004) note that ''C. gigantea'' is very similar to ''Cyathea glabra'' and appears to form part of a complex that also includes ''Cyathea podophylla'' and ''Cyathea subdubia''. Further study is needed to determine the nature of the relationship between these taxa. The specific epithet ''gigantea'' refers, at least in part, to the large fronds. ==References== *Braggins, John E. & Large, Mark F. 2004. ''Tree Ferns''. Timber Press, Inc., p. 136. ISBN 0-88192-630-2 *(The International Plant Names Index: ''Cyathea gigantea'' ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cyathea gigantea」の詳細全文を読む スポンサード リンク
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