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Pteridophyte Phylogeny Group (PPG) taxonomic system for ferns and lycophytes
https://pteridogroup.github.io/
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Recognition of Leptogramma as a segregate of Stegnogramma (Thelypteridoideae; Thelypteridaceae) [PASSED] #61

Open susanfawcett opened 7 months ago

susanfawcett commented 7 months ago

Author(s) of proposal

Susan Fawcett and Alan R. Smith

Name of taxon

Leptogramma

Rank of taxon

Genus

Approximate number of species affected

29

Description of change

In light of the morphological differences between the Stegnogramma and Leptogramma clades, we follow Kuo et al. (2019), in recognizing Leptogramma as a distinct genus (Fawcett et al. 2021). Leptogramma is distinguished from its sister genus Stegnogramma by veins free, or if anastomosing, only one or two pairs united below the sinus between adjacent lateral veins (vs. usually three or more), and by the presence of long multicellular hairs on rachises.

Reason for change

Leptogramma is a morphologically distinct clade sister to Stegnogramma s.s. (including Dictyocline). Alternatively, Leptogramma may be considered a synonym of a more broadly defined Stegnogramma.

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

Kuo, L. Y., Y. H. Chang, Y. H. Huang, W. Testo, A. Ebihara, G. Rouhan, L. G. Quintanilla, J. E. Watkins Jr., Y. M. Huang, and F. W. Li. 2020. A global phylogeny of Stegnogramma ferns (Thelypteridaceae): Generic and sectional revision, historical biogeography and evolution of leaf architecture. Cladistics 36: 164–183.

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.

Reference(s) for publication of the name

Leptogramma J. Sm., J. Bot. (Hooker) 4:51. 1842.

https://www.biodiversitylibrary.org/page/2911835#page/53/mode/1up

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 77 votes were cast. There were 72 'Yes' votes (93.5%) and 5 'No' votes (6.5%). The proposal passes.