Thallus ( pl. : thalli ), from Latinized Greek θαλλός ( thallos ), meaning "a green shoot " or " twig ", is the vegetative tissue of some organisms in diverse groups such as algae , fungi , some liverworts , lichens , and the Myxogastria . A thallus usually names the entire body of a multicellular non-moving organism in which there is no organization of the tissues into organs . Many of these organisms were previously known as the thallophytes , a polyphyletic group of distantly related organisms. An organism or structure resembling a thallus is called thalloid , thallodal , thalliform , thalline , or thallose .
3-527: Members of the Monoblepharidomycetes have a filamentous thallus that is either extensive or simple and unbranched. They frequently have a holdfast at the base. In contrast to other taxa in their phylum , some reproduce using autospores , although many do so through zoospores . Oogamous sexual reproduction may also occur. In addition to the type genus , the order Monoblepharidales includes Harpochytrium and Oedogoniomyces . Based on
6-458: 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 . 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
9-682: The work of "The Mycota: A Comprehensive Treatise on Fungi as Experimental Systems for Basic and Applied Research" and synonyms from "Part 1- Virae, Prokarya, Protists, Fungi". This Chytridiomycota -related article is a stub . You can help Misplaced Pages by expanding it . Thallus Even though thalli do not have organized and distinct parts ( leaves , roots , and stems ) as do the vascular plants , they may have 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
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