1) Fungus genus 2) Genus pleurotus 
Pleurotus is a genus of gilled mushrooms which includes one of the most widely eaten mushrooms, P. ostreatus. Species of Pleurotus may be called oyster, abalone, or tree mushrooms, and are some of the most commonly cultivated edible mushrooms in the world. Pleurotus fungi have been used in mycoremediation of pollutants such as petroleum and polycy...
[n] - agarics with white spores and caps having an eccentric stem
genus Pleurotus noun agarics with white spores and caps having an eccentric stem; an important mushroom of Japan