The FB stays put (like a plant), but it is the ‘fruit’ of the fungus. The fungus itself, which is made up of mycelium (pl) (mycelia - singular) moves outward in search of nutrients until blocked physically (or chemically). Chitan (a polysaccharide) is the same material that the exoskeleton of arthropods (insects, spiders, crustaceans) is made of. 006-001