Rapa Nui Filmy-Fern (Hymenophyllum sp.)

This genus almost certainly once occurred on Rapa Nui; I personally have no idea if there are spore findings to prove that or if this name appears in the listing mentioned below just as a hypothetical account. [1] 

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References:  

[1] Jean-François Butaud: Inventaire des espèces natives de l’île de Pâques, pp. 138-139. In: l’île de Pâques. Le nombril du monde? MUSEO Éditions 2018

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edited: 21.01.2022