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 in English during the 14th century, the word "oyster" comes from Old French "oistre", in turn from Latin "ostrea", the feminine form of "ostreum", which is the latinisation of the Greek ὄστρεον ("ostreon"), "oyster". Compare ὀστέον ("osteon"), "bone". True oysters are members of the family Ostreidae. This family includes the edible oysters, which mainly belong to the genera "Ostrea", "Crassostrea", "Ostreola", "Magallana", and "Saccostrea". Examples include the Belon oyster, eastern oyster, Olympia oyster, Pacific oyster, and the Sydney rock oyster. Almost all shell-bearing mollusks can secrete pearls, yet most are not very valuable. Pearls can form in both saltwater and