Biological pretreatment of corn stover with a fungus called P. brevispora can help make it easier to turn the plant material into ethanol. The researchers found that keeping the corn stover moist and letting the fungus grow for about 42 days at a specific temperature worked best. They also discovered that the fungus didn't produce harmful byproducts during the process. By using different types of yeast, they were able to produce ethanol efficiently from the pretreated corn stover. This study shows that P. brevispora has potential for making ethanol from plant waste.