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Taxonomy, biogeography and evolution of plants
RESEARCH ARTICLE

Genetic variation and phylogeography of the Australian and New Zealand fern Asplenium flabellifolium (Aspleniaceae)

Daniel J. Ohlsen https://orcid.org/0000-0002-8030-7349 A D , Lara D. Shepherd B , Leon R. Perrie B , Patrick J. Brownsey https://orcid.org/0000-0002-3456-3800 B and Michael J. Bayly https://orcid.org/0000-0001-6836-5493 C
+ Author Affiliations
- Author Affiliations

A Royal Botanic Gardens, Private Bag 2000, Birdwood Avenue, South Yarra, Vic. 3141, Australia.

B Museum of New Zealand Te Papa Tongarewa, PO Box 467, 55 Cable Street, Wellington, 6140, New Zealand.

C School of BioSciences, The University of Melbourne, Royal Parade, Parkville, Vic. 3010, Australia.

D Corresponding author. Email: ohlsend@gmail.com

Australian Systematic Botany 33(4) 412-426 https://doi.org/10.1071/SB20001
Submitted: 9 January 2020  Accepted: 8 April 2020   Published: 1 June 2020

Abstract

Asplenium flabellifolium Cav. is a cytologically variable Australian and New Zealand fern. Here, we sequence chloroplast trnL-trnF and rps4-trnS from samples throughout its range to provide the first phylogeographic investigation of a fern common in both countries. Twenty-three haplotypes were detected, which formed six haplogroups in a network. Australian specimens were placed in all haplogroups. The placement of New Zealand haplotypes in five of the haplogroups suggests that this species has dispersed across the Tasman Sea at least five times. Sexually reproducing plants of lower ploidy, detected only in south-eastern Australia, contained haplotypes from the two haplogroups that are successive sisters to the remaining diversity in the phylogeny. This likely suggests that A. flabellifolium was originally a sexually reproducing species in south-eastern Australia and spread to the rest of its distribution where apomictic plants dominate. More than one haplogroup was detected in several areas across its distribution, suggesting that these areas were colonised several times. Other areas harboured several haplotypes from a single haplogroup or haplogroups not recovered elsewhere, indicating possible long-term persistence in these areas. Haplotypes and morphological features were not found to be exclusive to either breeding system or ploidy and no taxonomic revision is proposed.

Additional keywords: apomixis, long-distance dispersal, refugia, taxonomy, trans-Tasman dispersal.


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