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Abstract: Numerous investigations have been undertaken in various parts of the world since the beginning of this century on the gases produced by Agaricus bisporus. This paper summarizes a number of these studies. The most intensively investigated gas has been CO2. More recently a number of other gases produced by the mycelium and the fruiting body have been isolated. They were separated by gas phase chromatography and identified by chromatography and infrared spectroscopy. They include ethylene, acetaldehyde, acetone, ethyl alcohol and ethyl acetate. These data have been verified and investigations on others are under way. The main question being asked about these gases is what effect they have on the life cycle of the mushroom, especially on the initiation of fruiting and on the morphology and structure of the mushroom. Information is given about the studies that are being made if these gases are produced by the mushroom itself and if they are artificially added. Subjects for future research are suggested.
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