A review of the fern genus Pellaea (Pteridaceae) in Australasia
Patrick J. Brownsey
A E , Daniel J. Ohlsen B C , Lara D. Shepherd A , Whitney L. M. Bouma D , Erin L. May B C , Michael J. Bayly B and Leon R. Perrie A
+ Author Affiliations
- Author Affiliations
A Museum of New Zealand Te Papa Tongarewa, Wellington, 6011, New Zealand.
B School of BioSciences, The University of Melbourne, Vic. 3010, Australia.
C Royal Botanic Gardens Victoria, Birdwood Avenue, South Yarra, Vic. 3141, Australia.
D School of Biological Sciences, Victoria University of Wellington, Wellington, 6012, New Zealand.
E Corresponding author. Email: patb@tepapa.govt.nz
Australian Systematic Botany 33(5) 446-457 https://doi.org/10.1071/SB20006
Submitted: 27 February 2020 Accepted: 13 May 2020 Published: 15 July 2020
Abstract
Five indigenous species of Pellaea in Australasia belong to section Platyloma. Their taxonomic history is outlined, morphological, cytological and genetic evidence for their recognition reviewed, and new morphological and chloroplast DNA-sequence data provided. Australian plants of P. falcata (R.Br.) Fée are diploid and have longer, narrower pinnae than do New Zealand plants previously referred to P. falcata, which are tetraploid. Evidence indicates that P. falcata does not occur in New Zealand, and that collections so-named are P. rotundifolia (G.Forst.) Hook. Chloroplast DNA sequences are uninformative in distinguishing Australian P. falcata from New Zealand P. rotundifolia, but show that Australian P. nana is distinct from both. Sequence data also show that Australian and New Zealand populations of P. calidirupium Brownsey & Lovis are closely related, and that Australian P. paradoxa (R.Br.) Hook. is distinct from other Australian species. Although P. falcata is diploid and P. rotundifolia tetraploid, P. calidirupium, P. nana (Hook.) Bostock and P. paradoxa each contain multiple ploidy levels. Diploid populations of Pellaea species are confined to Australia, and only tetraploids are known in New Zealand. Evolution of the group probably involved hybridisation, autoploidy, alloploidy, and possibly apomixis. Further investigation is required to resolve the status of populations from Mount Maroon, Queensland and the Kermadec Islands.
Additional keywords: Cheilanthoideae, chloroplast DNA sequences, cytology, phylogeny, taxonomy.
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