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Specimens of a New Zealand Adiantum , morphologically intermediate between A. cunninghamii Hook. and A. fulvum Raoul, are considered to represent a good species to which the name A. viridescens Col. must be applied. The species is most closely related to A. silvaticum Tindale of eastern Australia. All four species are illustrated and their diagnostic characters discussed in detail.
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Parris et al. (1974) studied this question.
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