Sphaeropteris medullaris, synonym Cyathea medullaris, commonly known as mamaku or 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 Island. Its other Māori names include katātā, kōrau, or pītau.
Sphaeropteris medullaris is common in lowland forest throughout the North Island of New Zealand. In the South Island its distribution is more localised. It is fairly common in wetter coastal areas, but rare in the drier eastern parts ...
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