• Most fungi grow as thread-like filaments called hyphae.
  • Each hypha consists of one or more cells surrounded by a tubular cell wall.
  • Hyphae make up the body of a fungus, which is called a mycelium (plural, mycelia) One of the largest living organisms on Earth is theMycelium of a single fungus.
  • A small part of a similar fungus is pictured in Figure below.
  • It covers 8.9 square kilometers (3.4 square miles) in an Oregon forest.
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