Recovery of Choristosoria (Pteridaceae) [NOT PASSED]

[MoniPonce]

Author(s) of proposal

M. M. Ponce and M. A. Scataglini

Name of taxon

Choristosoria

Rank of taxon

Genus

Approximate number of species affected

Eight

Description of change

Eight species from Africa and Madagascar, usually assigned to Cheilanthes s.l. or Pellaea s.l., would correspond to the monotypic paleotropical genus Choristosoria Mett. ex Kuhn, 1879

Reason for change

Eight paleotropical species (Cheilanthes induta, C. multifida, C. namaquensis, C. quadripinnata, Pellaea calomelanos, P. involuta, P. pteroides and P. viridis), belonging to the clade of the South American genera Adiantopsis, Doryopteris and Mineirella, appear in our phylogeny, joined with 98% support in a clade that would correspond to the monotypic genus Choristosoria Mett. ex Kuhn, 1879, based on C. pteroides).
Some of these species were previously included in the "Choristosoria grade", but without support, in the phylogeny of Yesilyurt et al. 2015.
The relationships between the clade proposed here as Choristosoria and the three related South American genera mentioned above, could not been resolved yet with the plastid markers used.
The eight species clustered in our phylogeny differ from Cheilanthes by their pinnae or ultimate segments hastate or ovate-hastate; laminar margins finely crenate-dentate (vs. ultimate segments ovate, triangular, oblong or linear; laminar margins entire or lobulate); and from Pellaea differ by their laminae usually pedate-pinnatifid up to pedate-4-pinnate, having the basal basiscopic portions of the basal pinnae more developed or divided, (vs. pinnate up to 3-pinnate, not pedate); indusia discrete, lobulate, truncate or oblong, membranous (vs. indusia continuous, slightly or strongly revolute, unmodified or slightly hyaline tissue).

Reference(s) for publication of the name

Yesilyurt et al_Doryopteris_Phytotaxa 221 (2) 101–122.pdf
Ponce & Scataglini_Phylogeny of Cheilanthesof and new genus Mineirella.pdf

List the numbers of any related issues

No response

Code of Conduct

• I agree to follow the PPG Code of Conduct

[MoniPonce]

In relation to the comments on our proposals (#41 and #42), we are submitting the advances presented at the XXXIX Jornadas Argentinas de Botánica held in September 2023.
Poster Pellaeopsis - Choristosoria- PPG2.pdf

[SchneiderHarald]

It is nice to see the reintroduction of a long forgotten generic concept. However, I am wondering if the generic boundaries have been already sufficiently clarified.

[joelnitta]

This proposal was voted on during PPG Ballot 4 (voting period October 2023). A total of 47 votes were cast. There were 28 'Yes' votes (59.6%) and 19 'No' votes (40.4%). The proposal does not pass.