https://gardenology.mywikis.net/w/index.php?action=history&feed=atom&title=Psilotales 2026-04-11T15:28:10Z Revision history for this page on the wiki MediaWiki 1.35.3 https://gardenology.mywikis.net/w/index.php?title=Psilotales&diff=2423&oldid=prev 2007-04-08T12:42:20Z

<p></p> <p><b>New page</b></p><div>{{Taxobox<br /> | color = lightgreen<br /> | name = Psilotales<br /> | image = Psilotum.jpg<br /> | image_width = 240px<br /> | image_caption = Closeup of ''Psilotum nudum''<br /> | regnum = [[Plant]]ae<br /> | divisio = [[Pteridophyta]]<br /> | classis = [[Psilotopsida]]<br /> | ordo = Psilotales<br /> | subdivision_ranks = Families<br /> | subdivision = <br /> [[Psilotaceae]]&lt;br/&gt;<br /> }}<br /> <br /> '''Psilotales''' is an [[order (biology)|order]] (i.e., order) of the [[Class (biology)|Class]] [[Psilotopsida]]. This order contains one family, [[Psilotaceae]], with only two living genera, ''[[Psilotum]]'', small shrubby plants of the dry tropics commonly known as &quot;Whisk ferns&quot;, and ''[[Tmesipteris]]'', an [[epiphyte]] found in [[Australia]], [[New Zealand]], and [[New Caledonia]]. There has long been controversy about the relationships of the Psilotophyta, with some claiming that they are [[fern]]s (Pteridophyta), and others maintaining that they are descendants of the first vascular plants (the [[Psilophyta]] of the [[Devonian]] period). Recent evidence from [[DNA]] demonstrates a much closer relationship to the ferns, and that they are closely related to the [[Ophioglossales]], in particular.<br /> <br /> All Psilotales share a few characteristics. Psilotales are [[vascular plant]]s. They lack leaves, instead having small outgrowths called ''enations''. The enations are not considered true leaves because there is only a vascular bundle just underneath them, but not inside, as in leaves. Psilotales also do not have true [[root]]s. They are anchored by [[rhizoid]]s. Absorption is aided by symbiotic [[fungus|fungi]] called [[mycorrhizae]].<br /> <br /> Three [[sporangium|sporangia]] are united into a ''synangium'', which is considered to be a very reduced series of branches. There is a thick tapetum to nourish the developing [[spore]]s, as is typical of ''eusporangiate'' plants. The [[gametophyte]] looks like a small piece of subterranean stem, but produces [[antheridium|antheridia]] and [[archegonium|archegonia]].<br /> <br /> ==External links==<br /> * [http://www.ucmp.berkeley.edu/plants/pterophyta/psilotales.html Introduction to the Psilotales]<br /> <br /> [[Category:Pteridophyta]]</div>

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