Button Mushrooms (<i>Agaricus bisporus</i>) (IMAGE) DOE/Joint Genome Institute Caption The button mushroom (Agaricus bisporus) is the world's most cultivated mushroom and has adapted to growing in humus-rich environments. Credit Fred Stevens Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.