Australian tree fern

:  a fast-growing tree fern (Cyathea cooperi) native to Australia that has broad, finely-divided fronds and a thin stem and that is cultivated as an ornamental His black-bottom lagoon-style pool features two 20-feet-tall Australian tree ferns nearby. — Christine Cole, Orlando Sentinel, 2 Apr. 2004 An avenue of Australian tree ferns spreads great green fronds to create a delicate pattern of light and dark over indigenous Irish ferns below. — Brian De Breffny, Architectural Digest, October 1986