A whole plant in the gametophytic phase that has a flat growth form and no distinct organs.
Source:PO_REF:00001
Comment
A thallus is a gametophyte of liverworts and pteridophytes and develops from a short-lived protonema. Roughly two dimensional growth results from division of a single apical cell. Thalli may be ribbon or heart shaped or almost filamentous. Although there are no distinct organs, there may be tissue differentiation and dichotomous branching.
Subset
Pteridophytes
Bryophytes
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