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Liverworts (Marchantia polymorpha) do not have roots.  They have root-like structures called rhizoids.  Rhizoids appear to originate primarily from the center of each thallus.

Liverworts (Marchantia polymorpha)

In the image above, a liverwort thallus was turned upside down to view the rhizoids, which appear a tangled mess of white strands.

Liverworts (Marchantia polymorpha)

Another view of rhizoids from the underside of a liverwort thallus.

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