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Pteridophyte Phylogeny Group (PPG) taxonomic system for ferns and lycophytes
https://pteridogroup.github.io/
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Recircumscription of Pneumatopteris, and recognition of segregate genera Hoiokula, Pakau, and Reholttumia (Thelypteridoideae; Thelypteridaceae) [PASSED] #57

Open susanfawcett opened 7 months ago

susanfawcett commented 7 months ago

Author(s) of proposal

Susan Fawcett and Alan R. Smith

Name of taxon

Pneumatopteris, Hoiokula, Pakau, Reholttumia

Rank of taxon

Genus

Approximate number of species affected

34

Description of change

Pneumatopteris as recognized by Holttum (1982) and PPG I is highly polyphyletic, with its species resolving in 10 distinct clades (Fawcett et al. 2021). The proposal redefines Pneumatopteris in a narrower sense and recognizes three segregate genera.

The type species of Pneumatopteris Nakai resolves in a small clade that is sister to the large genus Sphaerostephanos. The largest clade within Pneumatopteris s.l. (which resolves as sister to Pneumatopteris s.s. plus Sphaerostephanos) was named Reholttumia S.E. Fawc. & A.R. Sm. (Fawcett and Smith 2021). One alternative taxonomic solution would be to expand Sphaerostephanos, which is a morphologically diverse genus that already includes nearly 200 species. We prefer to recognize Pneumatopteris s.s. and Reholttumia, which are both morphologically coherent.

Pakau S.E. Fawc. & A.R. Sm. is recognized as a genus with a single species, Pakau pennigera, which is endemic to New Zealand and Australia, and is not closely related to any other genera.

Hoiokula S.E. Fawc. & A.R. Sm. is recognized as a distinct genus of two species endemic to the Hawaiian Islands that is distantly related to all other species of Pneumatopteris s.l.

For keys and morphological descriptions, see Fawcett & Smith 2021. For phylogenetic analyses, see Fawcett et al. 2021.

Fawcett_Smith_2021.pdf Fawcett_2021_GlobalPhylogeny.pdf

Reason for change

Pneumatopteris as recognized by Holttum (1982) and PPG I is highly polyphyletic, with its species resolving in 10 distinct clades (Fawcett et al. 2021). The proposal redefines Pneumatopteris in a narrower sense and recognizes three monophyletic segregate genera.

Fawcett, S. and A. R. Smith. 2021. A Generic Classification of the Thelypteridaceae. Sida, Botanical Miscellany 59. Fort Worth: Botanical Research Institute of Texas Press.

Fawcett, S., Smith, A.R., Sundue, M., Burleigh, J.G., Sessa, E.B., Kuo, L.Y., Chen, C.W., Testo, W.L., Kessler, M. and Barrington, D.S., 2021. A global phylogenomic study of the Thelypteridaceae. Systematic Botany, 46(4), pp.891-915.

Fawcett, S., A. R. Smith, M. Sundue, J. G. Burleigh, E. B. Sessa, L.-Y. Kuo, C.-W. Chen, W. L. Testo, and M. Kessler. GoFlag Consortium, and D. S. Barrington. 2021. Data from: A global phylogenomic study of the Thelypteridaceae. Dryad Digital Repository. https: doi.org/10. 5061/dryad.gxd2547j4.

Holttum, R. E. 1977. The family Thelypteridaceae in the Pacific and Australasia. Allertonia 1: 169–234.

Holttum, R. E. 1982. Thelypteridaceae. Flora Malesiana, ser. II 1: 334–560.

Reference(s) for publication of the name

Fawcett_Smith_2021.pdf

List the numbers of any related issues

No response

Code of Conduct

joelnitta commented 5 months ago

This proposal was voted on during PPG Ballot 7 (voting period January 2024). A total of 76 votes were cast. There were 75 'Yes' votes (98.7%) and 1 'No' votes (1.3%). The proposal passes.