Sylem: Difference between revisions

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Linney 26:
#''[[Angiospermae]]'': shimmey dooie angiospermagh t'ayn. Cha nel fo-hylem erbee ec ny [[monocotyn]], agh t'eh ry-akin ayns possanyn elley. Ta fo-hylem ayn ny dyn rere dooie, as ny keayrtyn rere çhymbyllaght aase hene; t'eh ec y derrey villey, agh cha nel ec y billey elley 'sy dooie cheddin. Cha nel strughtooryn fo-hylem ny caghlaaghyn dooie casley rish y cheilley. Ta fo-hylem biljyn angiospermagh goll er creck myr [[fuygh creoi]].
 
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==Aafilley sylem==
[[Coadan:ficusxylem.jpg|thumb|300px|Caslyssyn-soilshey jeh sylem ayns sthole [[billey figgagh]] (''Ficus alba'')]]
Line 42 ⟶ 41:
| doi = 10.3732/ajb.89.2.185
| earishlioar = American Journal of Botany
}}</ref>. Agh cha nee angiospermae ynrican s'oc cuishlinyntracheagyn, as cha nel y lheid ec shiartanse dy henn linneeaghtyn Howeverangiospermagh, themyr occurrence of vessel elements is not restricted to angiosperms, and they are absent in some archaic or "basal" lineages of the angiosperms: (e.g.sampleyr, [[Amborellaceae]], [[Tetracentraceae]], [[Trochodendraceae]], andas [[Winteraceae]]), and their secondary xylem is described by [[Arthur Cronquist]] as "primitively vesselless". Cronquist considered the vessels of ''[[Gnetum]]'' to be convergent with those of angiosperms<ref>
{{cite book
|author=Cronquist, A.
|year=1988.
|title=The Evolution and Classification of Flowering Plants
|location=New York, New York
|publisher=New York Botanical Garden Press
|month=August
|isbn=978-0893273323
}}</ref>. Whether the absence of vessels in basal angiosperms is a [[cladistics#Definitions|primitive]] condition is contested, the alternative hypothesis states that vessel elements originated in a precursor to the angiosperms and were subsequently lost.
 
==SeeJeeagh alsoer==
* [[Cohesion-tension theory]]
* [[Phloem]]
 
* [[Secondary growth]]
* [[Transpirational pull]]
* [[Vascular tissue]]
* [[Vascular bundle]]
* [[Tylosis (Botany)|Tylosis]]
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== Imraaghyn ==
{{rolleyimraaghyn}}