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- Q500230 subject Q8804353.
- Q500230 subject Q8804763.
- Q500230 subject Q9147617.
- Q500230 abstract "Psilotaceae is a family of fern-like plants (in order Psilotales) consisting of two genera, Psilotum and Tmesipteris. The two genera are very different and in the past Tmesipteris has been placed in its own family, Tmesipteridaceae, but most classifications continue to place it in Psilotaceae. The relationships of Psilotaceae have been unclear, in part because the plants lack roots or true leaves, but recent molecular systematic studies suggest a relationship to the fern family Ophioglossaceae.The first genus, Psilotum, consists of small shrubby plants of the dry tropics commonly known as "Whisk ferns". The other genus, Tmesipteris, is an epiphyte found in Australia, New Zealand, and New Caledonia. There has long been controversy about the relationships of the Psilotaceae, with some claiming that they are ferns (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.All Psilotaceae share a few characteristics. They are vascular plants and they lack leaves, having instead 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 roots. They are anchored by rhizoids. Absorption is aided by symbiotic fungi called mycorrhizae.Three 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 spores, as is typical of eusporangiate plants. The gametophyte looks like a small piece of subterranean stem, but produces antheridia and archegonia.".
- Q500230 class Q132139.
- Q500230 division Q178249.
- Q500230 kingdom Q756.
- Q500230 thumbnail Psilotum.jpg?width=300.
- Q500230 wikiPageExternalLink psilotales.html.
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- Q500230 wikiPageWikiLink Q132139.
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- Q500230 wikiPageWikiLink Q178249.
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- Q500230 wikiPageWikiLink Q850653.
- Q500230 wikiPageWikiLink Q8804353.
- Q500230 wikiPageWikiLink Q8804763.
- Q500230 wikiPageWikiLink Q9147617.
- Q500230 wikiPageWikiLink Q927944.
- Q500230 wikiPageWikiLink Q944420.
- Q500230 wikiPageWikiLink Q99974.
- Q500230 classis Q132139.
- Q500230 divisio Q178249.
- Q500230 name "Psilotaceae".
- Q500230 regnum "Plantae".
- Q500230 type Eukaryote.
- Q500230 type Fern.
- Q500230 type Plant.
- Q500230 type Species.
- Q500230 type Thing.
- Q500230 type Q19088.
- Q500230 type Q756.
- Q500230 comment "Psilotaceae is a family of fern-like plants (in order Psilotales) consisting of two genera, Psilotum and Tmesipteris. The two genera are very different and in the past Tmesipteris has been placed in its own family, Tmesipteridaceae, but most classifications continue to place it in Psilotaceae.".
- Q500230 label "Psilotaceae".
- Q500230 depiction Psilotum.jpg.
- Q500230 name "Psilotaceae".