Lactarius britannicus is a species of milk-cap mushroom sufficiently uncommon to lack an English name despite its striking appearance.
Like all milk-caps, a milky liquid seeps out when the flesh is cut or broken. In this species the liquid is initially milky in colour, but then turns yellow – best seen on a handkerchief.
Some reference sources claim that Lactarius britannicus should be identified with Lactarius fulvissimus. The fulvissimus species has a cap which gets pale at the rim .