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Fungi are classified in their own kingdom separate from the Plant kingdom: the kingdom Fungi. Smith did not classify fungi as plants. They are similar to plants because they have cell walls, but the structure of the cell walls is very different. The cells of fungi contain chitin instead of cellulose which is found in plant cell walls. Chitin is found in the exoskeletons of insects and crustaceans. Fungal cells are also mostly haploid and not diploid like plant cells.
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