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  • The vegetative bodies of most fungi is usually hidden, being diffusely organized around and within the tissues of their food sources.
  • The body of the fungi is composed of basic building units called hyphae which are minute threads of tubular walls surrounding the plasma membrane and cytoplasm.
  • When combined, hyphae form an interwoven mat called mycelium the "feeding" network of a fungus.
  • Hyphae are usually divided into cells by crosswalls called septa.
  • Septa usually have pores large enough to allow ribosomes, mitochondria and even nuclei to flow from cell to cell.
  • Fungi cell walls are made of chitin a nitrogen containing polysaccharide wall.
  • Some Fungi are aseptate meaning their hyphae are not divided by septa. These type of fungi are called coenocytic fungi.
  • Some fungi have haustoria which are modified hyphae that penetrate their host to absorb nutrients.