Pleurotus ostreatus
The Pleurotaceae are a family of small to medium-sized mushrooms which have white spores. The family contains four genera ("Nematoctonus" has been synonymized with "Hohenbuehelia", but not all of its species have been moved to valid genera) and 94 species. Members of Pleurotaceae can be mistaken for members of Marasmiaceae. Perhaps the best known member is the oyster mushroom, "Pleurotus ostreatus".