Argyrochosma palmeri

==Taxonomy==

==Taxonomy==

''Notholaena palmeri'' was first [[species description|described]] by Baker in 1887, in [[Joseph Dalton Hooker|Hooker]]'s ''Icones Plantarum''.{{sfn|Hooker|1887|p=pl. 1678}} The description is based on material collected by [[Charles Christopher Parry]] and [[Edward Palmer (botanist)|Edward Palmer]] in [[San Luis Potosi]], the latter of whom is honored by the specific epithet. A critical revision of ''[[Notholaena]]'' by [[Charles Alfred Weatherby]], completed after his death by [[Rolla M. Tryon Jr.]], revealed that the collected material theretofore identified as ''N. palmeri'' was different from the [[type specimen]], having a chestnut-brown rachis with glands and a few scales, and the new species ''[[Notholaena pallens|N. pallens]]'' was created for this material in 1956.{{sfn|Tryon|Weatherby|1956|pp=77–78}} Additional collections of ''N. palmeri'' have since been made.{{sfn|Mickel|Smith|2004|p=70}}

''Notholaena palmeri'' was first [[species description|described]] by [[John Gilbert Baker]] in 1887, in [[Joseph Dalton Hooker|Hooker]]'s ''Icones Plantarum''. The description is based on material collected by [[Charles Christopher Parry]] and [[Edward Palmer (botanist)|Edward Palmer]] in [[San Luis Potosi]], the latter of whom is honored by the specific epithet.{{sfn|Hooker|1887|p=pl. 1678}} A critical revision of ''[[Notholaena]]'' by [[Charles Alfred Weatherby]], completed after his death by [[Rolla M. Tryon Jr.]], revealed that the collected material theretofore identified as ''N. palmeri'' was different from the [[type specimen]] (''Parry & Palmer 991'' at the [[Kew Herbarium]]), having a chestnut-brown rachis with glands and a few scales, and the new species ''[[Notholaena pallens|N. pallens]]'' was created for this material in 1956.{{sfn|Tryon|Weatherby|1956|pp=77–78}} Additional collections of ''N. palmeri'' have since been made.{{sfn|Mickel|Smith|2004|p=70}}

While Tryon considered it impossible to reasonably subdivide ''Notholaena'' into sections based on the data available at the time,{{sfn|Tryon|Weatherby|1956|p=6}} both [[Edwin Copeland]] and Weatherby himself had suggested in the 1940s that a group of ferns related to [[Notholaena nivea|''N. nivea'']] might represent a distinct genus of its own.{{sfn|Windham|1987|p=37}} This was finally addressed in 1987 by [[Michael D. Windham]], who was carrying out phylogenetic studies of these genera. He elevated ''Notholaena'' sect. ''Argyrochosma'' to become the genus ''[[Argyrochosma]]'',{{sfn|Windham|1987|p=38}} and transferred this species to that genus as ''A. palmeri''.{{sfn|Windham|1987|p=40}} In 2018, [[Maarten J. M. Christenhusz]] transferred the species to ''[[Hemionitis]]'' as ''H. palmeri'', as part of a program to consolidate the cheilanthoid ferns into that genus.{{sfn|Christenhusz|Fay|Byng|2018|p=19}}

While Tryon considered it impossible to reasonably subdivide ''Notholaena'' into sections based on the data available at the time,{{sfn|Tryon|Weatherby|1956|p=6}} both [[Edwin Copeland]] and Weatherby himself had suggested in the 1940s that a group of ferns related to [[Notholaena nivea|''N. nivea'']] might represent a distinct genus of its own.{{sfn|Windham|1987|p=37}} This was finally addressed in 1987 by [[Michael D. Windham]], who was carrying out phylogenetic studies of these genera. He elevated ''Notholaena'' sect. ''Argyrochosma'' to become the genus ''[[Argyrochosma]]'',{{sfn|Windham|1987|p=38}} and transferred this species to that genus as ''A. palmeri''.{{sfn|Windham|1987|p=40}} In 2018, [[Maarten J. M. Christenhusz]] transferred the species to ''[[Hemionitis]]'' as ''H. palmeri'', as part of a program to consolidate the cheilanthoid ferns into that genus.{{sfn|Christenhusz|Fay|Byng|2018|p=19}}