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Tuber ladder fern, (Nephrolepis cordifolia) is a fern native to northern Australia and Asia. It has many common names including erect sword fern, narrow sword fern and ladder fern, fishbone fern, and herringbone fern. It is similar to the related fern Nephrolepis exaltata.
The species is native in north eastern Australia, and is considered naturalised on the central east coast of New South Wales.
N. cordifolia has become an invasive species is some areas where it has been introduced. In New Zealand it is listed on the National Pest Plant Accord preventing the sale, cultivation and distribution of the plant. It is listed as an invasive species in Florida, United States.