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<p><b>New page</b></p><div>{{short description|Undifferentiated vegetative tissue of certain organisms}}<br />
{{about|the undifferentiated tissue}}<br />
{{Redirect|Thalli|the Indian village|Thally}}<br />
[[File:Pellia epiphylla 200108.jpg|thumb|300x300px|Thallus of ''[[Pellia epiphylla]]'']]<br />
'''Thallus''' ({{plural form}}: '''thalli'''), from [[Latin]]ized [[Ancient Greek|Greek]] {{Lang|el|θαλλός}} ({{Lang|el-Latn|thallos}}), meaning "a green [[Shoot (botany)|shoot]]" or "[[twig]]", is the vegetative tissue of some [[organism]]s in diverse groups such as [[algae]], [[fungi]], some [[Marchantiophyta|liverworts]], [[lichen]]s, and the [[Myxogastria]]. A thallus usually names the entire body of a multicellular non-moving organism in which there is no organization of the [[tissue (biology)|tissues]] into [[organ (anatomy)|organs]].<ref>{{cite book |last=Haupt |first=Arthur W. |url=https://archive.org/details/plantmorphology00haup |title=Plant Morphology |publisher=McGraw-Hill Book company |year=1953 |location=New York |page=[https://archive.org/details/plantmorphology00haup/page/7 7]}}</ref> Many of these organisms were previously known as the [[thallophyte]]s, a [[polyphyly|polyphyletic]] group of distantly related organisms. An organism or structure resembling a thallus is called '''thalloid''', '''thalloidal''', '''thalliform''', '''thalline''', or '''thallose'''.<br />
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Even though thalli do not have organized and distinct parts ([[leaf|leave]]s, [[root]]s, and [[Plant stem|stems]]) as do the [[vascular plant]]s, they may have [[Analogy (biology)|analogous]] structures that resemble their vascular "equivalents". The analogous structures have similar function or macroscopic structure, but different microscopic structure; for example, no thallus has [[vascular tissue]]. In exceptional cases such as the [[Lemnoideae]], where the structure of a vascular plant is in fact thallus-like, it is referred to as having a thalloid structure, or sometimes as a thalloid.<br />
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Although a thallus is largely undifferentiated in terms of its anatomy, there can be visible differences and functional differences. A [[kelp]], for example, may have its thallus divided into three regions. The parts of a kelp thallus include the holdfast (anchor), stipe (supports the blades) and the blades (for photosynthesis).<ref>{{Cite web|url=http://www.botany.hawaii.edu/faculty/wong/Bot201/Myxomycota/Thallusdefinition.htm|title=The term thallus is a botanical term that refers to the body of a plant that does not have leaves|website=www.botany.hawaii.edu}}</ref><br />
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The thallus of a [[fungus]] is usually called a [[mycelium]]. The term thallus is also commonly used to refer to the [[vegetative reproduction|vegetative]] body of a lichen. In [[seaweed]], thallus is sometimes also called '[[frond]]'.<br />
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The [[gametophyte]] of some non-thallophyte plants – [[clubmoss]]es, [[horsetail]]s, and [[fern]]s is termed "[[prothallus]]".<br />
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==See also==<br />
* [[Homothallism]]<br />
* [[Heterothallism]]<br />
* ''[[Wengania]]''<br />
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==References==<br />
{{Reflist}}<br />
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[[Category:Plant morphology]]<br />
[[Category:Fungal morphology and anatomy]]</div>imported>Asieon