 The likewise very common Lactarius deliciosus is similar in appearance . Lactarius deterrimus differs basically from the first because its flesh becomes reddish within 10 minutes and in about 30 minutes dark maroon , caused by the discolouration of the milk . The milk of L. deliciosus stays orange or becomes reddish within 30 minutes . Also , the milk of the latter tastes mild , while the milk of the first distinctly bitter . The cap of L. deterrimus changes its colour in old age or if injured distinctly greenish and is common only under spruces , while L. deliciosus is native under pines . 
