单词 | tree fern |
释义 | tree fern (once / 72069 pages) n WORD FAMILY tree fern: tree ferns USAGE EXAMPLESSpecies such as the Australian tree fern are using up vital water supplies within native forests on Hawaii, home to unique species found nowhere else. BBC(Jul 04, 2014) Permian forests of tree ferns and cycads vanished, replaced by huge expanses of a few weedy plant species. New York Times(Feb 20, 2014) “There are a lot of tree ferns, pines and magnolia trees. Scientific American(Oct 24, 2013) n any of numerous usually tropical ferns having a thick woody stem or caudex and a crown of large fronds; found especially in Australia and New Zealand; chiefly of the families Cyatheaceae and Marattiaceae but some from Polypodiaceae Hypo|Hyper Cyathea medullaris, black tree fern, sago fern, silver tree fern a showy tree fern of New Zealand and Australia having a crown of pinnated fronds with whitish undersides Dicksonia antarctica, soft tree fernof Australia and Tasmania; often cultivated; hardy in cool climates Cibotium barometz, Scythian lambAsiatic tree fern having dense matted hairs sometimes used as a styptic Thyrsopteris elegans, thyrsopterisa terrestrial tree fern of South America Angiopteris evecta, angiopteris, giant fernhighly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall fern any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores |
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