Schizophyllum commune is a common species of fungus in the genus Schizophyllum. It was initially described as a morphological species of global distribution and then revealed to be a species complex encompassing several cryptic species of more narrow distribution, as typical of many mushroom-forming Basidiomycota. The gills, which produce basidiospores on their surface, split when the mushroom dries out, earning this mushroom the common name split gill. It has more than 28,000 sexes. It is common in rotting wood, but can also cause disease in humans.