Nephrolepis cordifolia, is a fern native to northern Australia and Asia. It has many common names including fishbone fern,tuberous sword fern,tuber ladder fern, erect sword fern, narrow sword fern and ladder fern, and herringbone fern. It is indigenous to the Hawaiian Islands where it is known as kupukupu, okupukupu or ni'ani'au. It is similar to the related fern Nephrolepis exaltata. It has been introduced into Bermuda, French Polynesia, New Zealand, and the United States. The species is native in north eastern Australia, and is considered naturalised on the central east coast of New South Wales.