Fungus (see below), which are produced by very closely related "Aspergilli". Quorn, a meat substitute, is made from "Fusarium venenatum". Edible mushrooms include commercially raised and wild-harvested fungi. "Agaricus bisporus", sold as button mushrooms when small or Portobello mushrooms when larger, is the most widely cultivated species in the West, used in salads, soups, and many other dishes. Many Asian fungi are commercially grown and have increased in popularity in the West. They are often available fresh in grocery stores and markets, including straw mushrooms ("Volvariella volvacea"), oyster mushrooms ("Pleurotus ostreatus"), shiitakes ("Lentinula edodes"), and enokitake ("Flammulina" spp.). Many other mushroom
Oyster must be discarded. Some dead oysters, or oyster shells which are full of sand, may be closed. These make a distinctive noise when tapped, and are known as "clackers". Opening oysters, referred to as "oyster-shucking", requires skill. The preferred method is to use a special knife (called an oyster knife, a variant of a shucking knife), with a short and thick blade about long. While different methods are used to open an oyster (which sometimes depend on the type), the following is one commonly accepted oyster-shucking method. Inexperienced shuckers can apply too much force, which can result in injury if