 Fern species with short trunks in the genera "Blechnum, Calochleana, Cnemedaria, Culcita" (mountains only tree fern), "Cystodium", "Leptopteris", "Lophosoria", "Sadleria", "Thyrsopteris" and "Todea" could also be considered tree ferns in a liberal interpretation of the term.Tree ferns are found growing in tropical and subtropical areas worldwide, as well as cool to temperate rainforests in Australia, New Zealand and neighbouring regions (e.g.Lord Howe Island, etc.