 Suillus collinitus is a pored mushroom of the genus Suillus in the family Suillaceae . It is an edible mushroom found in European pine forests . The mushroom has a reddish to chestnut @-@ brown cap that reaches up to 11 cm ( 4 @.@ 3 in ) in diameter , and a yellow stem measuring up to 7 cm ( 2 @.@ 8 in ) tall by 1 to 2 cm ( 0 @.@ 4 to 0 @.@ 8 in ) thick . On the underside of the cap are small angular pores , initially bright yellow before turning greenish @-@ brown with age . A characteristic feature that helps to distinguish it from similar Suillus species , such as S. granulatus , is the pinkish mycelia at the base of the stem . 
