Abstract
A widely cultivated fern with dimorphic sterile and fertile pinnae, abundant production of vegetative bulbils, and aborted spores is described as Asplenium ×lucrosum Perrie et Brownsey nothosp. nov. It has previously been confused with A. bulbiferum, with which it shares the production of bulbils. Evidence from chloroplast DNA sequences and morphology is presented for the origin of A. ×lucrosum, probably in cultivation, as a hybrid between the New Zealand endemic A. bulbiferum and the Norfolk Island endemic A. dimorphum. The confusion of A. bulbiferum with A. ×lucrosum has led to the latter being used inadvertently in revegetation projects in New Zealand where it is has become a ‘casual’ adventive through its vegetative bulbil propagation.
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