Kidney Ferns, Trichomanes reniforme | ©Steve Reekie (Aotearoa, New Zealand). The Kidney fern, Trichomanes reniforme, is a filmy fern species native to New Zealand. It commonly grows on the forest floor of open native bush. Individual kidney-shaped ferns stand about 5-10 cm tall. They shrivel when they dry out, but open up again when moisture returns. This species has very thin fronds which are only four to six cells in thickness. In the Māori language they are also called Raurenga.
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