Mushroom is a colour that is appearing in Shetlands in the UK. It ranges from a deep chocolate to a light mocha body colour with flaxen mane and tail. This dilute was first believed to only show on red base ponies, some ponies have been tested and proven to be red base. In recent years there are several ponies that have a more buckskin look to them that the breeders claim them to be black based Mushroom. It was up until genetic testing for the Extension it was assumed that the red based ponies were black based with the Silver gene. According to the breeders of ponies with the Mushroom colour the gene breeds recessive.