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'''''Jamesonia''''' is a genus of [[fern]]s in the subfamily [[Pteridoideae]] of the family [[Pteridaceae]]. It now includes the formerly separate genus '''''Eriosorus'''''.<ref name=PPGI/>
'''''Jamesonia''''' is a genus of [[fern]]s in the subfamily [[Pteridoideae]] of the family [[Pteridaceae]]. It now includes the formerly separate genus '''''Eriosorus'''''.<ref name=PPGI/>

==Description==
Species of ''Jamesonia'' are terrestrial or grow on rocks. They vary considerably in their detailed morphology. The [[rhizome]]s 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'',<ref name=DellPrad20/> but do not correspond to the evolutionary history of the species.<ref name=Sanc04/> 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 stalk ([[Petiole (botany)|petiole]]) of the frond is dark brown and usually grooved on the upper (adaxial) surface. The [[Sorus|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.<ref name=DellPrad20/>


==Taxonomy==
==Taxonomy==
Line 16: Line 19:


==Phylogeny==
==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 family identified in a 2017 study.<ref name=ZhanZhouLuZhan17/>
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.<ref name=ZhanZhouLuZhan17/>
{{clade
{{clade
|label1=JAPSTT clade
|label1=JAPSTT clade
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<ref name=Christenhusz-2011>{{cite journal|last1=Christenhusz|first1=Maarten J. M.|last2=Zhang|first2=Xian-Chun |last3=Schneider|first3=Harald|title=A linear sequence of extant families and genera of lycophytes and ferns|journal=Phytotaxa|volume=19|issue=1|year=2011|pages=7|issn=1179-3163|doi=10.11646/phytotaxa.19.1.2|doi-access=free}}</ref>
<ref name=Christenhusz-2011>{{cite journal|last1=Christenhusz|first1=Maarten J. M.|last2=Zhang|first2=Xian-Chun |last3=Schneider|first3=Harald|title=A linear sequence of extant families and genera of lycophytes and ferns|journal=Phytotaxa|volume=19|issue=1|year=2011|pages=7|issn=1179-3163|doi=10.11646/phytotaxa.19.1.2|doi-access=free}}</ref>


<ref name=PaboGonz15>{{Citation |last1=Pabón-Mora |first1=Natalia |last2=González |first2=Favio |date=2015 |title=''Nephopteris'' out of the clouds: Molecular evidence places the enigmatic ''N. maxonii'' (Pteridaceae) within the ''Jamesonia''clade |journal=Brittonia |volume=68 |pages=83–92 |doi=10.1007/s12228-015-9394-0 |lastauthoramp=yes }}</ref>
<ref name=DellPrad20>{{Citation |mode=cs1 |last1=Della |first1=Aline Possamai |last2=Prado |first2=Jefferson |date=2020 |title=''Jamesonia'' (Pteridaceae) in Brazil |journal=Biota Neotropica |volume=20 |issue=2 |page=e20200986 |doi=10.1590/1676-0611-bn-2020-0986 |lastauthoramp=yes }}</ref>

<ref name=PaboGonz15>{{Citation |mode=cs1 |last1=Pabón-Mora |first1=Natalia |last2=González |first2=Favio |date=2015 |title=''Nephopteris'' out of the clouds: Molecular evidence places the enigmatic ''N. maxonii'' (Pteridaceae) within the ''Jamesonia''clade |journal=Brittonia |volume=68 |pages=83–92 |doi=10.1007/s12228-015-9394-0 |lastauthoramp=yes }}</ref>


<ref name=PPGI>{{Citation |mode=cs1 |author=PPG I |year=2016 |title=A community-derived classification for extant lycophytes and ferns |journal=Journal of Systematics and Evolution |volume=54 |issue=6 |pages=563–603 |doi=10.1111/jse.12229}}</ref>
<ref name=PPGI>{{Citation |mode=cs1 |author=PPG I |year=2016 |title=A community-derived classification for extant lycophytes and ferns |journal=Journal of Systematics and Evolution |volume=54 |issue=6 |pages=563–603 |doi=10.1111/jse.12229}}</ref>

Revision as of 08:14, 19 September 2020

Jamesonia
Jamesonia sp. (codiferous)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Family: Pteridaceae
Subfamily: Pteridoideae
Genus: Jamesonia
Hook. & Grev.
Species

See text.

Synonyms[1]
  • Eriosorus Fée
  • Nephopteris Lellinger

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 stalk (petiole) of the frond is 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 William Jackson Hooker and Robert Kaye Greville in 1830, initially with one species, Jamesonia pulchra. 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.[4][1] A further study in 2015 showed that the genus Nephopteris with the sole species N. maxonii belonged in the same clade.[5] 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.[6]

JAPSTT clade

Species

References

  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.
  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. {{citation}}: Unknown parameter |lastauthoramp= ignored (|name-list-style= suggested) (help)
  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. ^ 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.
  5. ^ 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. {{citation}}: Unknown parameter |lastauthoramp= ignored (|name-list-style= suggested) (help)
  6. ^ 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. {{citation}}: Unknown parameter |lastauthoramp= ignored (|name-list-style= suggested) (help)

Bibliography

Wikimedia Commons has media related to Jamesonia.
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