Algae have thallus. It is neatly organized. This is called
thallus organisatin.
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what is thallus
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It's called a thallus.
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The lichen thallus is the entire lichen, consisting of the fungi
part and the algae part. Thallus means that the entire "body" isn't
divided into roots, stem and leaves.
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Yes ferns do have a thallus, and yes they are vascular
plants.