what is thallus?

Thallus refers to the plant body which is not properly differentiated or distinguished into root, stem and leaves. Plants having thallus type of body are called thallophytes. This includes Algae, Bryophytes and Pteridophytes. 

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Thallus is the undifferentiated vegetative tissue of organisms which do not show motion (non-mobile). These organisms were formerly knows as thallophytes.

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thallus which have no root stem and leaves...

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it is green shoot or twig , which is undifferentiated vegetative tissue of some organism in diverse groups such as algae , fungus,some liverworts,lichens,and myxogastria.many of these were known as thallophytes.organism having thallus are called as thalloid.

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