Lauren H. answered 08/04/18
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Fungi possess cell walls made of the N-acetylglucosamine polymer chitin.
The primary cell wall of land plants is composed of the polysaccharides, cellulose, hemicelluloses and pectin.
This answer is a straight lift from Wikipedia.
As I read the answer, I see that fungal cell walls are composed mostly of one substance; plant cell walls are more complex.