Researchers tested how three types of edible and medicinal fungi could improve the nutritional quality of agricultural plant waste for feeding livestock. They found that one fungus species, Ceriporiopsis subvermispora, was particularly effective at breaking down tough plant fibers, especially in rapeseed straw and spent reed materials. The fungal treatment not only made the feed easier for ruminant animals to digest but also reduced methane gas production, which is beneficial for environmental sustainability.