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Noun1.thyrsopteris - a terrestrial tree fern of South Americathyrsopteris - a terrestrial tree fern of South America
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
genus Thyrsopteris - one species