It is found in large parts of the Pacificm including the Marquesas, Rapa Iti, Fiji, the New Hebrides, the Kermadec Islands, the Solomons, Java and Malaya.
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A. oblongifolium is found on the North, South, Chatham and Kermadec Islands, and is found from the coast to the mountains.
The species has also been found in other sub-tropical regions around the South Pacific at greater depths, including New Zealand's Kermadec Islands, and Australia's lower east coast - off Danger Point to Montague Island, New South Wales (at about 200 m), Lord Howe Island and the Norfolk Island Ridge.
Its range extends from East Africa to Australia and the Kermadec Islands including Hawaii, Easter Island and the Ryukyu Islands.
Cyathea kermadecensis, a tree fern species endemic to Raoul Island in the Kermadec Islands
Another brief flurry of activity occurred when Felix von Luckner, imprisoned on Motuihe Island after being captured in the Society Islands, escaped and commandered a small vessel before being recaptured in the Kermadec Islands.
Raoul Island, also called "Sunday Island", Kermadec Islands, New Zealand