Английская Википедия:Alsophila (plant)

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Файл:Silver Fern Koru2.JPG
Unfurling frond of Alsophila dealbata (silver fern)

Alsophila is a genus of tree ferns in the family Cyatheaceae.[1] It has also been considered to be a section in the subgenus Cyathea of the genus Cyathea.

Description

Species of Alsophila have a treelike growth habit, with an erect trunk that rarely branches, or sometimes a more shrublike habit, with a creeping stem. Their fronds are large, with a strawlike stalk (stipe), dark brown or black in colour. Brown or dark brown scales are present, with distinct margins. The blade (lamina) of the frond is divided one to three times (one- to three-pinnate). The sori (spore-producing structures) are rounded and borne on smaller veins on the lower surface of the frond. An indusium (a covering to the sori) may or may not be present; if present initially, it may be lost as the frond ages.[2]

Alsophila is now separated from the other genera in the family Cyatheaceae primarily on the basis of molecular phylogenetic studies.[1] The scales on the stalks (petioles) provide a morphological distinction. Alsophila has scales with distinct margins, unlike Sphaeropteris, and with an apical hair or spine (seta), unlike Cyathea. The ornamentation of the spores also distinguishes Alsophila and Cyathea.[3][4]

Taxonomy

The genus Alsophila was erected by Robert Brown in 1810.[5] It is placed in the family Cyatheaceae.[1] The division of the family into genera has had a long and controversial history.[4] Three or four clades have been suggested based on molecular phylogenetic studies. The Pteridophyte Phylogeny Group classification of 2016 (PPG I) accepts three genera, placing the Gymnosphaera clade within Alsophila.[1] In 2018, Dong and Zuo proposed the relationship shown in the cladogram below, and provided names in Gymnosphaera for species they considered to belong in this genus.[6] Шаблон:Clade

Older sources, such as the New Zealand Organisms Register Шаблон:As of and Large and Braggins (2004), place Alsophila within a broadly defined Cyathea.[7][8]

Species

The Pteridophyte Phylogeny Group classification of 2016 (PPG I) accepted the genus Alsophila with 275 species.[1] Шаблон:As of, Plants of the World Online accepted 248 species.[9] Шаблон:Div col

Шаблон:Div col end

Formerly placed here

(Partial list)

Distribution and habitat

The genus Alsophila is native in tropical and subtropical areas, from North and South America, through Africa, Madagascar and tropical Asia, to eastern Australasia as far south as the subantarctic Auckland Islands.[9][2] It is found in moist montane forests, on slopes or in ravines, forming part of the lower canopy, middle understorey, or ground layers.[2]

Cultivation

Alsophila species all require frost-free or virtually frost-free, permanently moist, shaded conditions. Those which have been grown in Europe outside their native habitat include A. australis, A. cunninghamii, A. dealbata, A. leichhardtiana and A. rebeccae.[11] Other species are grown in their native regions. In Australia, A. australis is commonly grown and is a robust species, capable of tolerating some sun if kept in moist soil.[12] A. dregei is a popular garden plant in South Africa, with plants being collected for use from the wild sufficiently often to cause it to become extinct in some areas.[13]

Culture

The silver fern, Alsophila dealbata has become a widely recognised symbol of New Zealand, although it is not an official national symbol.[14]

In the 1971 comedy film A New Leaf, Henrietta Lowell (played by Elaine May) is a botanist whose dream is to classify a new species of fern. On a honeymoon trip, she indeed discovers a new species which she names Alsophila grahami after her new husband Henry Graham (Walter Matthau). She describes the plant as having a vestigial indusium.

References

Шаблон:Reflist

Шаблон:Taxonbar

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  1. ↑ 1,0 1,1 1,2 1,3 1,4 Ошибка цитирования Неверный тег <ref>; для сносок PPGI не указан текст
  2. ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег <ref>; для сносок FoC_10240 не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок WeigLehn16 не указан текст
  4. ↑ 4,0 4,1 Ошибка цитирования Неверный тег <ref>; для сносок KoraConaMetzSchn07 не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок IPNI_328001-2 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок DongZuo18 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок NZOR не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок LargBrag04 не указан текст
  9. ↑ 9,0 9,1 Ошибка цитирования Неверный тег <ref>; для сносок POWO_328001-2 не указан текст
  10. ↑ 10,0 10,1 Ошибка цитирования Неверный тег <ref>; для сносок WF_86 не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок WaltBradBricCull86 не указан текст
  12. ↑ Шаблон:Citation
  13. ↑ Шаблон:Citation
  14. ↑ Шаблон:Cite encyclopedia
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