Term: soft tree fern: of Australia and Tasmania; often cultivated; hardy in cool climates
Broader: 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 | Unrelated: permanganate: a dark purple salt of permanganic acid; in water solution it is used as a disinfectant and antiseptic