Jamesonia

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Jamesonia
Jamesonia alstonii in habitat, Cerro de la Muerte, Costa Rica
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Family: Pteridaceae
Subfamily: Pteridoideae
Genus: Jamesonia
Hook. & Grev.
Type species
Jamesonia pulchra
Species

See text.

Synonyms[1]
  • 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[edit]

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]

Botanical illustration of Jamesonia verticalis and Jamesonia hispidula (syn. Eriosorus hispidulus); the first with "Jamesonia-type" morphology, the second with "Eriosorus-type" morphology

Taxonomy[edit]

The genus Jamesonia was first described by William Jackson Hooker and Robert Kaye Greville in 1830, initially with one species, Jamesonia pulchra. The genus name of Jamesonia was in honour of William Jameson (1796–1873), who was a Scottish-Ecuadorian 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[edit]

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

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. 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. 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:

References[edit]

  1. ^ a b c d PPG I (2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229. S2CID 39980610.
  2. ^ a b Della, Aline Possamai & Prado, Jefferson (2020). "Jamesonia (Pteridaceae) in Brazil". Biota Neotropica. 20 (2): e20200986. doi:10.1590/1676-0611-bn-2020-0986. hdl:11449/197001.
  3. ^ a b Sánchez-Baracaldo, Patricia (2004). "Phylogenetics and biogeography of the neotropical fern genera Jamesonia and Eriosorus (Pteridaceae)". American Journal of Botany. 91 (2): 274–284. doi:10.3732/ajb.91.2.274. PMID 21653383.
  4. ^ Burkhardt, Lotte (2022). Eine Enzyklopädie zu eponymischen Pflanzennamen [Encyclopedia of eponymic plant names] (pdf) (in German). Berlin: Botanic Garden and Botanical Museum, Freie Universität Berlin. doi:10.3372/epolist2022. ISBN 978-3-946292-41-8. S2CID 246307410. Retrieved January 27, 2022.
  5. ^ Christenhusz, Maarten J. M.; Zhang, Xian-Chun; Schneider, Harald (2011). "A linear sequence of extant families and genera of lycophytes and ferns". Phytotaxa. 19 (1): 7. doi:10.11646/phytotaxa.19.1.2. ISSN 1179-3163.
  6. ^ Pabón-Mora, Natalia & González, Favio (2015). "Nephopteris out of the clouds: Molecular evidence places the enigmatic N. maxonii (Pteridaceae) within the Jamesoniaclade". Brittonia. 68: 83–92. doi:10.1007/s12228-015-9394-0. S2CID 15337534.
  7. ^ a b Zhang, Liang; Zhou, Xin-Mao; Lu, Ngan Thi & Zhang, Li-Bing (2017). "Phylogeny of the fern subfamily Pteridoideae (Pteridaceae; Pteridophyta), with the description of a new genus: Gastoniella". Molecular Phylogenetics and Evolution. 109: 59–72. doi:10.1016/j.ympev.2016.12.037. PMID 28049040.
  8. ^ Nitta, Joel H.; Schuettpelz, Eric; Ramírez-Barahona, Santiago; Iwasaki, Wataru; et al. (2022). "An Open and Continuously Updated Fern Tree of Life". Frontiers in Plant Science. 13: 909768. doi:10.3389/fpls.2022.909768. PMC 9449725. PMID 36092417.
  9. ^ "Tree viewer: interactive visualization of FTOL". FTOL v1.5.0 [GenBank release 256]. 2023. Retrieved 17 August 2023.

Bibliography[edit]

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