Melanoleuca melaleuca

''Melanoleuca melaleuca'' is a species of mushroom in the Tricholomataceae family, and it is the type species of its genus ''Melanoleuca''. It is difficult to distinguish from other related species firstly because it is variable, secondly because the taxonomic criteria are often based on characteristics which have later been found to be variable, and thirdly because there is much disagreement between authorities as to exactly how the species should be defined.