recognition of xApseudathyrium and xCornoathyrium [PASSED]

[crothfels]

Author(s) of proposal

Carl Rothfels

Name of taxon

xApseudathyrium, xCornoathyrium

Rank of taxon

Nothogenus

Approximate number of species affected

4

Description of change

Recognize the two nothogenera: xApseudathyrium (Athyrium x Pseudathyrium) and xCornoathyrium (Athyrium x Cornopteris).

Reason for change

Given the recognition of Cornopteris and Pseudathyrium as distinct from Athyrium, the recognition of these two nothogenera is necessary.

There is one known species of xApseudathyrium, xA. reichsteinii, a diploid hybrid between A. filix-femina and P. distentifolium (Schneller & Rasbach 1983). Triploids also occur; these have been named as nothosubspecies (Rasbach et al. 1991).

There are three reported species in xCornoathyrium: xC. cornopteroides (A. kuratae x C. opaca), xC. glabrescens (A. kuratae x C. decurrenti-alata), and xC. petiolatum (A. yakusimensis x C. opaca).

56_56_7_7234.pdf Schneller - Hybrids and polyploidy in the genus Athyrium (Pter.pdf

Reference(s) for publication of the name

xApseudathyrium: Wan, Xia, and Li-Bing Zhang. 2022. “Three New Fern Names of Hybrid Genera and Four New Combinations in Athyriaceae, Osmundaceae, and Thelypteridaceae.” Phytotaxa 575 (1). https://doi.org/10.11646/phytotaxa.575.1.8.

xCornoathyrium: Toshiyuki Nakaike (1992). New Flora of Japan: Pteridophyta. Rev. & enlarg. ed. Shibundo, Tokyo. (thanks for this to @khorikhori -- I haven't been able to track down this paper myself)

Schneller - Hybrids and polyploidy in the genus Athyrium (Pter.pdf

Schneller & Rasbach 1984Hybrids and polyploids in Athyrium in Europe.pdf

56_56_7_7234.pdf

Wan and Zhang - 2022 - Three new fern names of hybrid genera and four new.pdf

List the numbers of any related issues

50, 32

Code of Conduct

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[khorikhori]

Cornoatyrium_Nakaike1992.pdf Here is the page of Cornoathyrium Nakaike 1992. These hybrids are perhaps extinct because of damages by deers.

[joelnitta]

This proposal was voted on during PPG Ballot 9 (voting period March 2024). A total of 74 votes were cast. There were 62 'Yes' votes (83.8%) and 12 'No' votes (16.2%). The proposal passes.