#tree_fern  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
  supertype:  fern  any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
  subtype:  silver_tree_fern__sago_fern__black_tree_fern__Cyathea_medullaris  showy tree fern of New Zealand and Australia area having a crown of much-pinnated fronds with whitish undersides
  subtype:  soft_tree_fern__Dicksonia_antarctica  of Australia and Tasmania; often cultivated; hardy in cool climates
  subtype:  Scythian_lamb__Cibotium_barometz  Asiatic tree fern having dense matted hairs sometimes used as a styptic
  subtype:  thyrsopteris__Thyrsopteris_elegans  a terrestrial tree fern of South America
  subtype:  angiopteris__angiopteri__giant_fern__giantfern__Angiopteris_evecta  highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall

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