Cyathea medullaris popularly known as the black tree fern is a large tree fern up to 20 m tall. It is distributed across the south-west Pacific from Fiji to Pitcairn and New Zealand. It is called mamaku katātā kōrau or pītau in the Māori language.
*Cyathea affinis (W. J. Hooker & Baker 1874 (non Cyathea affinis (J. R. Forster) Swartz 1801 non Cyathea affinis M. Martens & Galeotti 1842 (cannot be attributed to any species) non Cyathea affinis Brackenridge 1854; quae Cyathea propinqua), *Polypodium medullare (G. Forster 1786), *Alsophila lunulata (G. Forster 1786) R. Brown 1827 (non Alsophila lunulata Blume 1828; quae Cyathea junghuhniana), *Alsophila extensa (Desvald 1827 (non Alsophila extensa Blume 1828; quae Cyathea raciborskii), *Sphaeropteris medullaris (G. Forster) Bernhardi 1801)
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