Jamesonia

Jamesonia
	Jamesonia alstonii in habitat, Cerro de la Muerte, Costa Rica
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Family:	Pteridaceae
Subfamily:	Pteridoideae
Genus:	Jamesonia; Hook. & Grev.
Type species
	Jamesonia pulchra; Hook. & Grev.
Species
	See text.
Synonyms
	Eriosorus Fée; Nephopteris Lellinger; Psilogramme Kuhn;

Jamesonia is a genus of ferns in the subfamily Pteridoideae of the family Pteridaceae. It now includes the formerly separate genus Eriosorus.^[1]

Description

Species of Jamesonia are terrestrial or grow on rocks. They vary considerably in their detailed morphology. The rhizomes are short, dark brown, and creeping, with a more or less dense covering of hairs and bristles. The fertile and infertile fronds are similar. Species show one of two different frond morphologies, related to habitat. These were formerly used to distinguish Jamesonia and Eriosorus,^[2] but do not correspond to the evolutionary history of the species.^[3] Species with "Jamesonia-type" morphology have many fronds with short, often leathery pinnae, and are associated with exposed habitats. Species with "Eriosorus-type" morphology have fewer fronds with longer, thinner pinnae, and are associated with more sheltered areas including cloud forests. The stalks (petioles and rachises) of the frond are dark brown and usually grooved on the upper (adaxial) surface. The sori occur along the veins of the segments of the fronds or are sometimes spread more widely on the lower (abaxial) surface of the frond.^[2]

Taxonomy

The genus Jamesonia was first described by

botanist.^[4]

The genus Eriosorus, proposed by Antoine Fée in 1852, was recognized as closely related, both genera being placed in the taenitidoid group of the subfamily Pteridoideae. A molecular phylogenetic study in 2004 showed that neither genus was monophyletic on its own, but that together they formed a clade.^[3] Subsequent classifications have treated the two as a single genus, Jamesonia.^[5]^[1] A further study in 2015 showed that the genus Nephopteris with the sole species N. maxonii belonged in the same clade.^[6] It is now also included in Jamesonia.^[1]

Phylogeny

Within the subfamily Pteridoideae, Jamesonia forms a clade with five other genera, the so-called "JAPSTT" clade, which is one of four major clades within the subfamily Pteridoideae identified in a 2017 study.^[7]

External phylogeny^[7]

Internal phylogeny^[8]^[9]

JAPSTT clade

Jamesonia

Pterozonium

Tryonia

Taenitis

	Syngramma

	Austrogramme

Jamesonia

J. osteniana (Dutra) Gastony

J. rufescens (Fée) Christenh.

J. novogranatensis (A.F.Tryon) Christenh.

J. peruviana A.F.Tryon

	J. longipetiolata (Hieron.) Christenh.

	J. setulosa (Hieron.) Christenh.

J. blepharum A.F.Tryon

	J. cinnamomea Kunze

	J. verticalis Kunze

J. goudotii C.Chr.

	J. congesta (Christ) Christenh.

	J. warscewiczii (Mett.) Christenh.

J. bogotensis H.Karst.

J. imbricata (Cav.) Hook. & Grev.

	J. laxa Kuntze

	J. pulchra Hook. & Grev.

J. brasiliensis Christ

	J. alstonii A.F.Tryon

	J. canescens (Klotzsch) Kunze

	J. rotundifolia Fée

	J. scammaniae A.F.Tryon

J. insignis (Kuhn) Christenh.

	J. cuatrecasasii A.F.Tryon

	J. hispidula Kunze

	J. hirsutula (Mett.) Christenh.

	J. lindigii (Mett.) Christenh.

J. maxonii (Lellinger) Pabón-Mora & F.González

J. hirta (Kunth) Christenh.

J. flexuosa (Humb. & Bonpl.) Christenh.

	J. cheilanthoides (Sw.) Christenh.

	J. xelongata J.Sm.

Other species:

Jamesonia accrescens (A.F.Tryon) Christenh.
Jamesonia angusta (M.Kessler & A.R.Sm.) Christenh.
Jamesonia ascendens (A.R.Sm. & M.Kessler) Christenh.
Jamesonia aureonitens (Hook.) Christenh.
Jamesonia auriculata A.F.Tryon
Jamesonia biardii (Fée) Christenh.
Jamesonia boliviensis A.F.Tryon
Jamesonia caracasana (Baker) Christenh.
Jamesonia ceracea Maxon
Jamesonia chiapensis (Maxon) Christenh.
Jamesonia crespiana Bosco
Jamesonia ewanii (A.F.Tryon) Christenh.
Jamesonia feei (Copel.) Christenh.
Jamesonia flabellata (Hook. & Grev.) Christenh.
Jamesonia glaberrima (Maxon) Christenh.
Jamesonia glaziovii (C.Chr.) Christenh.
Jamesonia lechleri (Kuhn) Christenh.
Jamesonia madidiensis (M.Kessler & A.R.Sm.) Christenh.
Jamesonia mathewsii (Hook.) Christenh.
Jamesonia orbignyana (Kuhn) Christenh.
Jamesonia paucifolia (A.C.Sm.) Christenh.
Jamesonia robusta H.Karst.
Jamesonia scalaris Kunze
Jamesonia stuebelii (Hieron.) Christenh.
Jamesonia vellea (A.F.Tryon) Christenh.
Jamesonia wurdackii (A.F.Tryon) Christenh.

References

^
S2CID 39980610
.

^
hdl:11449/197001
.

^
PMID 21653383
.

S2CID 246307410
. Retrieved January 27, 2022.

ISSN 1179-3163
.

S2CID 15337534
.

^
PMID 28049040
.

PMID 36092417
.

^ "Tree viewer: interactive visualization of FTOL". FTOL v1.5.0 [GenBank release 256]. 2023. Retrieved 17 August 2023.

Bibliography

Wikimedia Commons has media related to Jamesonia.

Pichi-Sermolli, Rodolfo E. G. (1977). "Fragmenta Pteridologiae—VI". Webbia. 31 (1): 242.
ISSN 0083-7792
.

Schuettpelz, Eric; Schneider, Harald; Huiet, Layne; Windham, Michael D.; Pryer, Kathleen M. (2007). "A molecular phylogeny of the fern family Pteridaceae: Assessing overall relationships and the affinities of previously unsampled genera" (PDF). Molecular Phylogenetics and Evolution. 44 (3): 1172–1185.
PMID 17570688. Archived from the original
(PDF) on 2008-08-20.

Tryon, Alice F. (1970). "A monograph of the fern genus Eriosorus". Contributions from the Gray Herbarium of Harvard University. 200 (200): 54–174.
JSTOR 41764694
.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Jamesonia&oldid=1218733825"

[PPGI-1] 
S2CID 39980610
.

[DellPrad20-2] 
hdl:11449/197001
.

[Sanc04-3] 
PMID 21653383
.

[4] S2CID 246307410
. Retrieved January 27, 2022.

[Christenhusz-2011-5] ISSN 1179-3163
.

[PaboGonz15-6] S2CID 15337534
.

[ZhanZhouLuZhan17-7] 
PMID 28049040
.

[8] PMID 36092417
.

[9] "Tree viewer: interactive visualization of FTOL". FTOL v1.5.0 [GenBank release 256]. 2023. Retrieved 17 August 2023.

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