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Scaly Tree Ferns

Cyatheaceae

Description

provided by Flora of Zimbabwe
Tree-like plants with a trunk, terrestrial or lithophytic. Stem (trunk) large, erect, unbranched, densily covered in adventitious roots and leaf base scars. Fronds usually large, deeply 2-pinnatifid to 3-pinnate or 4-pinnatifid, borne at the apex of the trunk, tufted. Venation free, dichotomously forked, ending near the margin. Indumentum composed of contorted hairs and bracts with a fringed edge often ending in a seta. Sori circular, superficial on the veins before the bifurcation; indusium attached basally to the receptacle, cup-shaped when open; homosporus.
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Mark Hyde, Bart Wursten and Petra Ballings
bibliographic citation
Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Cyatheaceae Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/family.php?family_id=68
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Mark Hyde
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Bart Wursten
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Petra Ballings
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Flora of Zimbabwe

Cyatheaceae

provided by wikipedia EN

The Cyatheaceae are a family of ferns, the scaly tree ferns, one of eight families in the order Cyatheales in the Pteridophyte Phylogeny Group classification of 2016 (PPG I).[1] Alternatively, the family may defined much more broadly (Cyatheaceae sensu lato) as the only family in the Cyatheales, with the PPG I family treated as the subfamily Cyatheoideae.[2] The narrower circumscription is used in this article.

The family includes the world's tallest tree ferns, which reach heights up to 20 m. They are also very ancient plants, appearing in the fossil record in the late Jurassic, though the modern genera likely appeared in the Cenozoic. Cyatheaceae are the largest family of tree ferns, including about 640 species.[1] Cyatheaceae and Dicksoniaceae, together with Metaxyaceae and Cibotiaceae, do not form a strongly supported monophyletic group and could be paraphyletic, but several individual subgroups are well supported as being monophyletic. Cyatheaceae are leptosporangiate ferns, the most familiar group of monilophytes.[3]

The Cyatheaceae usually have a single, erect or creeping rhizome (stem). Their fronds (leaves) are also very large, although not as large as the tree ferns of the Marattiaceae. Some species have fronds reaching 3–4 m in length, and have a final crown width of some 6 m. The fronds are circinate before unfolding and usually pinnately or bipinnately compound, with deeply pinnately lobed leaflets. The large leaves are covered in scales and hairs, and bear sori (spore clusters) on their undersides.[4] The sori are often covered by a flap of tissue called an indusium, a useful characteristic for classifying the Cyatheaceae. Some indusia are cup-shaped (cyatheoid), while others are hood-shaped (hemitelioid), enclose the sorus (sphaeropteroid), or scaly. Like most ferns, members of the Cyatheaceae are homosporous. Cyatheaceae are found in both New and Old World tropical wet montane forests and cloud forests, with some species extending into south-temperate regions.[3] Most Cyatheaceae are terrestrial, with one being a facultative epiphyte and others having a creeping habit.

Long Bao Valley Cyatheaceae.jpg

Cyatheaceae can be distinguished from arborescent Dicksonia by the presence of scales, the position of the sori, and the morphology of sporangia and spores.[5] In the Cyatheaceae, the sori occur away from the margins of the pinnules, and are elongate or rounded.

Taxonomy

As of 2019, two different circumscriptions of the family Cyatheaceae are used, as summarized in the table below. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family is one of eight in the order Cyatheales, and has three genera.[1] In the classification of Christenhusz & Chase (2014), the family is the only one in the order Cytheales, the families of PPG I being reduced to subfamilies. It then has 13–14 genera.[2] The sensu stricto circumscription of PPG I is used here.

Genera

Since the exact number of species is not known, classification of the Cyatheaceae s.s. has had a long and controversial history, and is still undergoing revision. Three tentative clades have been developed: Alsophila, Cyathea, and Sphaeropteris. These are frequently used as genus names. Cnemidaria, Trichopteris (or Trichipteris), and Nephelea (or Nephelia) have also been suggested as genera. Initially, indusium and scale morphology were used to organize the Cyatheaceae into taxonomic ranks. Most recently, plastid DNA has been used, suggesting the Cyatheaceae should be split into four clades: Sphaeropteris, Cyathea, Alsophila, and Gymnosphaera + A. capensis. As of 2007, it remained unclear which of these groups should be considered genera and which subgenera.[3]

The Pteridophyte Phylogeny Group classification of 2016 (PPG I) accepts three genera, placing the Gymnosphaera clade within Alsophila:[1]

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. S2CID 39980610.
  2. ^ a b Christenhusz, Maarten J.M. & Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607.
  3. ^ a b c Korall, Petra; Conant, David S.; Metzgar, Jordan S.; Schneider, Harald & Pryer, Kathleen M. (2007). "A molecular phylogeny of scaly tree ferns (Cyatheaceae)". American Journal of Botany. 94 (5): 873–886. doi:10.3732/ajb.94.5.873. PMID 21636456. Retrieved 2019-08-22.
  4. ^ Judd, W.S., C.S. Campbell, E.A. Kellogg, P.F. Stevens, and M.J. Donoghue (Eds.) 2008. Plant Systematics: A Phylogenetic Approach, Third Edition. Sinauer Associates, Sunderland, Massachusetts, USA.
  5. ^ Holttum, R.E. and P.J. Edwards. 1983. The tree-ferns of Mount Roraima and neighbouring areas of the Guayana highlands with comments on the family Cyatheaceae. Kew Bulletin 38(2): 155-188.
  6. ^ Dong, Shi-Yong & Zuo, Zheng-Yu (2018). "On the Recognition of Gymnosphaera As a Distinct Genus in Cyatheaceae". Annals of the Missouri Botanical Garden. 103 (1): 1–23. doi:10.3417/2017049. S2CID 90852235.
  7. ^ 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.
  8. ^ "Tree viewer: interactive visualization of FTOL". FTOL v1.3.0. 2022. Retrieved 12 December 2022.
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Cyatheaceae: Brief Summary

provided by wikipedia EN

The Cyatheaceae are a family of ferns, the scaly tree ferns, one of eight families in the order Cyatheales in the Pteridophyte Phylogeny Group classification of 2016 (PPG I). Alternatively, the family may defined much more broadly (Cyatheaceae sensu lato) as the only family in the Cyatheales, with the PPG I family treated as the subfamily Cyatheoideae. The narrower circumscription is used in this article.

The family includes the world's tallest tree ferns, which reach heights up to 20 m. They are also very ancient plants, appearing in the fossil record in the late Jurassic, though the modern genera likely appeared in the Cenozoic. Cyatheaceae are the largest family of tree ferns, including about 640 species. Cyatheaceae and Dicksoniaceae, together with Metaxyaceae and Cibotiaceae, do not form a strongly supported monophyletic group and could be paraphyletic, but several individual subgroups are well supported as being monophyletic. Cyatheaceae are leptosporangiate ferns, the most familiar group of monilophytes.

The Cyatheaceae usually have a single, erect or creeping rhizome (stem). Their fronds (leaves) are also very large, although not as large as the tree ferns of the Marattiaceae. Some species have fronds reaching 3–4 m in length, and have a final crown width of some 6 m. The fronds are circinate before unfolding and usually pinnately or bipinnately compound, with deeply pinnately lobed leaflets. The large leaves are covered in scales and hairs, and bear sori (spore clusters) on their undersides. The sori are often covered by a flap of tissue called an indusium, a useful characteristic for classifying the Cyatheaceae. Some indusia are cup-shaped (cyatheoid), while others are hood-shaped (hemitelioid), enclose the sorus (sphaeropteroid), or scaly. Like most ferns, members of the Cyatheaceae are homosporous. Cyatheaceae are found in both New and Old World tropical wet montane forests and cloud forests, with some species extending into south-temperate regions. Most Cyatheaceae are terrestrial, with one being a facultative epiphyte and others having a creeping habit.

Long Bao Valley Cyatheaceae.jpg

Cyatheaceae can be distinguished from arborescent Dicksonia by the presence of scales, the position of the sori, and the morphology of sporangia and spores. In the Cyatheaceae, the sori occur away from the margins of the pinnules, and are elongate or rounded.

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cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
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wikipedia EN