joelnitta
commented
9 months ago This proposal was voted on during PPG Ballot 3 (voting period September 2023). A total of 69 votes were cast. There were 45 'Yes' votes (65.2%) and 24 'No' votes (34.8%). The proposal does not pass.
Author(s) of proposal
Ashley Field
Name of taxon
Dendroconche
Rank of taxon
Genus
Approximate number of species affected
6
Description of change
Testo et al. (2019) resurrected and re-circumscribed the genus Dendrodonche Copel. based on a molecular phylogenetic and morphological appraisal as part of a multi-genus approach to achieving monophyly from a previously paraphyletic Microsorum and Colysis. The abstract of Testo et al. (2019) is reproduced below:
"The taxonomy of the Polypodiaceae subfamily Microsoroideae is highly problematic, especially with respect to the circumscription of the highly variable and non-monophyletic genus Microsorum. Using phylogenetic analyses and morphological evidence, we demonstrate that sixteen taxa typically treated in the genera Microsorum and Colysis are not closely related to those groups and instead belong to three clades that are successive sister groups to the Old-World ant-fern genus, Lecanopteris. We use the available genus name Dendroconche for one of these clades and propose the new genera Bosmania and Zealandia to accommodate the remaining two groups. We provide a description and identify morphological synapomorphies for each of the genera, make new combinations and designate lectotypes where necessary, and present keys and descriptions for all relevant species. We also discuss the evolution of ant-fern associations in the lecanopteroid ferns and highlight the need for additional taxonomic work in the subfamily. The following new combinations are provided: Bosmania lastii, B . leandriana, B . membranacea, Dendroconche ampla, D . latilobata, D . linguiforme, D . sayeri, D . scandens, D . varians, Zealandia novae-zealandiae, Z . powellii, Z . pustulata, Z . pustulata subsp. howensis, and Z . vieillardii."
Reason for change
Multiple studies have shown that Microsorum and Colysis as adopted in PPG I (2016) were paraphyletic. This proposal is directed at achieving monophyly among relevant genera by recognition of three separate new genera for the clades presented by Testo et al. (2019) and also presented by Chen et al. (2020). This proposal should be read in conjunction with proposals for Bosmania + Lecanopteris s.s. + Zealandia sensu Testo et al. (2019) (#26, #27).
This proposal affects species occurring in Australia, Fiji, Indonesia, New Caledonia, New Zealand, Papua New Guinea and Solomon Islands. It was adopted by Australian Plant Census but not for the New Zealand Fern Flora or in An annotated checklist of lycophytes and ferns of the Solomon Islands. It has been superseded in World Ferns.
An alternative classification to achieve monophyly was presented by Perrie et al. (2021) by expanding the circumscription of Lecanopteris. This alternative proposal affects the same number of taxa overall and should be examined in the alternative proposal for Bosmania + Lecanopteris s.l. sensu Perrie et al. (2021) (#28).
Reference(s) for publication of the name
Testo W.L., Field A.R., Sessa E.B., Sundue M. (2019) Phylogenetic and Morphological Analyses Support the Resurrection of Dendroconche and the Recognition of Two New Genera in Polypodiaceae Subfamily Microsoroideae Systematic Botany 44(4): 1–16.
See also:
Chen C-C, Hyvönen J, Schneider H. 2020. Exploring phylogeny of the microsoroid ferns (Polypodiaceae) based on six plastid DNA markers. Molecular Phylogenetics and Evolution 143: 106665.
Field A.R. (2020) Classification and typification of Australian lycophytes and ferns based on Pteridophyte Phylogeny Group classification PPG I. Australian Systematic Botany 33(1): 1–102.
Perrie L.R., Field A.R., Ohlsen D.J., Brownsey P.J. (2021) Expansion of the fern genus Lecanopteris to encompass some species previously included in Microsorum and Colysis (Polypodiaceae) Blumea 66: 242–248.
List the numbers of any related issues
26, #27, #28
Code of Conduct