most fungi are made up of slender filaments called
The Body of a Fungus Fungi exist mainly in the form of slender filaments, barelyvisible to the naked eye, which are called hyphae (singular, hypha). These hyphae are typically made up of long chainsof cells joined end-to-end divided by cross-walls called septa (singular, septum).. Fungi have cell walls made of chitin. The cellwalls of fungi are built of polysaccharides (chains ofsugars) and chitin, the same tough material a crabshell is made of. The cell walls of plants are made ofcellulose, also a strong building material. 5.