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Noun1.Thallophyta - used only in former classifications: comprising what is now considered a heterogeneous assemblage of flowerless and seedless organisms: algae; bacteria; fungi; lichens
division - (botany) taxonomic unit of plants corresponding to a phylum
kingdom Plantae, plant kingdom, Plantae - (botany) the taxonomic kingdom comprising all living or extinct plants
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Other phylums include Spermatophyta, Pteridophyta, Thallophyta, and Bryophyta.
They are classified in the plant kingdom division Thallophyta, and vary in size from single-celled forms to the huge puffballs of the meadows.